adjective, busier, busiest.
actively and attentively engaged in work or a pastime: busy with her work.
not at leisure; otherwise engaged: He couldn't see any visitors because he was busy.
full of or characterized by activity: a busy life.
(of a telephone line) in use by a party or parties and not immediately accessible.
officious; meddlesome; prying.
ornate, disparate, or clashing in design or colors; cluttered with small, unharmonious details; fussy: The rug is too busy for this room.
verb (used with object), busied, busying.
to keep occupied; make or keep busy: In summer, he busied himself keeping the lawn in order.

before 1000; Middle English busi, bisi, Old English bysig, bisig; cognate with Middle Low German, Middle Dutch besich, Dutch bezig

nonbusy, adjective
overbusy, adjective
superbusy, adjective
unbusy, adjective
well-busied, adjective

1. assiduous, hard-working. Busy, diligent, industrious imply active or earnest effort to accomplish something, or a habitual attitude of such earnestness. Busy means actively employed, temporarily or habitually: a busy official. Diligent suggests earnest and constant effort or application, and usually connotes fondness for, or enjoyment of, what one is doing: a diligent student. Industrious often implies a habitual characteristic of steady and zealous application, often with a definite goal: an industrious clerk working for promotion. 2. occupied, employed, working.

1. indolent. 2. unoccupied.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
busy (ˈbɪzɪ)
adj , busier, busiest
1.  actively or fully engaged; occupied
2.  crowded with or characterized by activity: a busy day
3.  chiefly (US), (Canadian) (of a room, telephone line, etc) in use; engaged
4.  overcrowded with detail: a busy painting
5.  meddlesome; inquisitive; prying
vb , busier, busiest, busies, busying, busied
6.  (tr) to make or keep (someone, esp oneself) busy; occupy
[Old English bisig; related to Middle Dutch besich, perhaps to Latin festīnāre to hurry]

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. bisig "careful, anxious, busy, occupied," cognate with O.Du. bezich, Low Ger. besig; no known connection with any other Germanic or Indo-European language. Still pronounced as in M.E., but for some unclear reason the spelling shifted to -u- in 15c. The word was a euphemism for "sexually active"
in 17c. Of telephone lines, 1893. In M.E., sometimes with a sense of "prying, meddlesome," preserved in busybody. Busy work is first recorded 1910. The verb is O.E. bisgian.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Curiously, it was also one of the busiest months of the semester.
Its port is the world's busiest as measured by tonnage.
He had even been kept out of school during the busiest seasons.
It may seem strange that the world's busiest airport is getting writers on
  board at all.
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