adjective, logier, logiest.
lacking physical or mental energy or vitality; sluggish; dull; lethargic.

1840–50, Americanism; perhaps < Dutch log heavy, cumbersome + -y1

logily, adverb
loginess, noun
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a combining form used in the names of sciences or bodies of knowledge: paleontology; theology.
a termination of nouns referring to writing, discourses, collections, etc.: trilogy; martyrology.

Middle English -logie < Latin -logia < Greek. See -logue, -y3

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
logy (ˈləʊɡɪ)
adj , logier, logiest
chiefly (US) dull or listless
[C19: perhaps from Dutch log heavy]

n combining form
1.  indicating the science or study of: musicology
2.  indicating writing, discourse, or body of writings: trilogy; phraseology; martyrology
[from Latin -logia, from Greek, from logos word; see logos]
adj combining form
adj combining form
n combining form

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

"dull and heavy," 1848, Amer.Eng., perhaps from Du. log "heavy, dull."

"a speaking, discourse, treatise, doctrine, theory, science," from Gk. -logia (often via Fr. -logie or M.L. -logia), from root of legein "to speak;" thus, "the character or department of one who speaks or treats of (a certain subject);" see lecture.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

-logy suff.
Science; theory; study: dermatology.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Or if you remember that logy is an adjective, then logiest can clear your rack.
During the first ten or fifteen minutes of our interview he seemed logy and understandably preoccupied.
The motor screamed but the logy boat barely inched ahead.
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