tooth·less

[tooth-lis]
adjective
1.
lacking teeth.
2.
without a serrated edge, as a saw.
3.
lacking in force or sharpness; dull; ineffectual: a toothless argument.

Origin:
1350–1400; Middle English; see tooth, -less

tooth·less·ly, adverb
tooth·less·ness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
tooth (tuːθ) [Click for IPA pronunciation guide]
 
n , pl teeth
1.  any of various bonelike structures set in the jaws of most vertebrates and modified, according to the species, for biting, tearing, or chewingRelated: dental
2.  any of various similar structures in invertebrates, occurring in the mouth or alimentary canal
3.  anything resembling a tooth in shape, prominence, or function: the tooth of a comb
4.  any of the various small indentations occurring on the margin of a leaf, petal, etc
5.  any one of a number of uniform projections on a gear, sprocket, rack, etc, by which drive is transmitted
6.  taste or appetite (esp in the phrase sweet tooth)
7.  long in the tooth old or ageing: used originally of horses, because their gums recede with age
8.  tooth and nail with ferocity and force: we fought tooth and nail
 
vb
9.  (tr) to provide with a tooth or teeth
10.  (intr) (of two gearwheels) to engage
 
Related: dental
 
[Old English tōth; related to Old Saxon tand, Old High German zand, Old Norse tonn, Gothic tunthus, Latin dens]
 
'toothless
 
adj
 
'toothlike
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Toothless is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Etymonline
Word Origin & History

toothless
late 14c., in literal sense, from tooth + -less. Figurative sense of "dull" is recorded from 1590s; that of "lacking enforcement powers" is first recorded 1961.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
And the region's anti-corruption outfits are proving toothless, sidelined or
  simply embattled.
But if they can't do this, then the mandate is toothless.
He flashed a toothless smile and sauntered on through the mud.
The second complaint is that the oath's fine words are toothless.
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