adjective, slower, slowest.
moving or proceeding with little or less than usual speed or velocity: a slow train.
characterized by lack of speed: a slow pace.
taking or requiring a comparatively long time for completion: a slow meal; a slow trip.
requiring or taking a long time for growing, changing, or occurring; gradual: a plant of slow growth.
sluggish in nature, disposition, or function.
dull of perception or understanding; mentally dull: a slow child.
not prompt, readily disposed, or in haste (usually followed by to or an infinitive): slow to anger; slow to take offense.
burning or heating with little speed or intensity, as a fire or an oven.
slack; not busy: The market was slow today.
having some quality that retards speed or causes movement, progress, work, etc., to be accomplished at less than the usual or expected rate of speed: a slow, careful worker; a slow road.
running at less than the proper rate of speed or registering less than the proper time, as a clock.
passing heavily or dragging, as time: It's been a slow afternoon.
not progressive; behind the times: a slow town.
dull, humdrum, uninteresting, or tedious: What a slow party!
Photography. requiring long exposure, as by having a small lens diameter or low film sensitivity: a slow lens or film.
(of the surface of a race track) sticky from a fairly recent rain and in the process of drying out.
adverb, slower, slowest.
in a slow manner; slowly: Drive slow.
verb (used with object)
to make slow or slower (often followed by up or down ).
to retard; reduce the advancement or progress of: His illness slowed him at school.
verb (used without object)
to become slow or slower; slacken in speed (often followed by up or down ).

before 900; Middle English; Old English slāw sluggish, dull; cognate with Dutch sleeuw; cf. sloth

slowly, adverb
slowness, noun
overslow, adjective
overslowly, adverb
overslowness, noun
ultraslow, adjective
ultraslowly, adverb
unslow, adjective
unslowly, adverb
unslowness, noun
unslowed, adjective

1, 2. unhurried. Slow, deliberate, gradual, leisurely mean unhurried and not happening rapidly. That which is slow acts or moves without haste or rapidity: a slow procession of cars. Deliberate implies the slowness that marks careful consideration before and while acting: a deliberate and calculating manner. Gradual suggests the slowness of something that advances one step at a time: a gradual improvement in service. That which is leisurely moves with the slowness allowed by ample time or the absence of pressure: an unhurried and leisurely stroll. 5. sluggardly, dilatory, indolent, lazy, slothful. 6. dense. See dull. 14. boring. 19. hinder, impede, obstruct.

1–3. fast. 19. advance.

As an adverb, slow has two forms, slow and slowly. Slowly appeared first in the 15th century; slow came into use shortly thereafter. Both are standard today in certain uses.
Originally, slow was used both preceding and following the verb it modified. Today, it is used chiefly in imperative constructions with short verbs of motion (drive, run, turn, walk, etc.), and it follows the verb: Drive slow. Don't walk so slow. This use is more common in speech than in writing, although it occurs widely on traffic and road signs. Slow also combines with present participles in forming adjectives: slow-burning; slow-moving. In this use it is standard in all varieties of speech and writing.
Slowly is by far the more common form of the adverb in writing. In both speech and writing it is the usual form in preverb position (He slowly drove down the street. The couple slowly strolled into the park) and following verbs that are not imperatives (He drove slowly down the street. The couple strolled slowly through the park). See also quick, sure. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To slow
World English Dictionary
slow (sləʊ)
1.  performed or occurring during a comparatively long interval of time
2.  lasting a comparatively long time: a slow journey
3.  characterized by lack of speed: a slow walker
4.  (prenominal) adapted to or productive of slow movement: the slow lane of a motorway
5.  (of a clock, etc) indicating a time earlier than the correct time
6.  given to or characterized by a leisurely or lazy existence: a slow town
7.  not readily responsive to stimulation; intellectually unreceptive: a slow mind
8.  dull or uninteresting: the play was very slow
9.  not easily aroused: a slow temperament
10.  lacking promptness or immediacy: a slow answer
11.  unwilling to perform an action or enter into a state: slow to anger
12.  behind the times
13.  (of trade, etc) unproductive; slack
14.  (of a fire) burning weakly
15.  (of an oven) cool
16.  photog requiring a relatively long time of exposure to produce a given density: a slow lens
17.  sport (of a track, etc) tending to reduce the speed of the ball or the competitors
18.  cricket (of a bowler, etc) delivering the ball slowly, usually with spin
19.  in a manner characterized by lack of speed; slowly
vb (often foll by up or down)
20.  to decrease or cause to decrease in speed, efficiency, etc
[Old English slāw sluggish; related to Old High German slēo dull, Old Norse slǣr, Dutch sleeuw slow]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. slaw "inactive, sluggish," also "not clever," from P.Gmc. *slæwaz (cf. O.S. sleu "blunt, dull," M.Du. slee, Du. sleeuw "sour, tart, blunt," O.H.G. sleo "blunt, dull," O.N. sljor, Dan. sløv, Swed. slö "blunt, dull"). Meaning "taking a long time" is attested from c.1230. Meaning
"dull, tedious" is from 1841. The verb is O.E. slawian; modern use may be a 16c. reformation. Slowpoke is first recorded 1848. Slow burn "delayed anger reaction" is attested from 1975.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases


In addition to the idioms beginning with slow, also see mills of the gods grind slowly; on the uptake, slow.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
By the time a driver felt the bumps under his tires, it was usually too late to
  stop or slow down.
Its slow and fast and slow and fast and slow and fast and maddeningly
  frustrating to follow in heavy traffic too.
My second way of editing myself is to try to slow down a little.
Some argued that it was exaggerated by the unsustainable boom in output and
  investment, and would slow when the economy faltered.
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