Etymology
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toothless (adj.)

Old English toðleas, in the literal sense; see tooth + -less. Figurative sense of "dull" is recorded from 1590s; that of "lacking enforcement powers" is first recorded 1961. Related: Toothlessly; toothlessness.

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Definitions of toothless

toothless (adj.)
lacking teeth;
a toothless old crone
most birds are toothless
toothless (adj.)
lacking necessary force for effectiveness;
a toothless piece of legislation
From wordnet.princeton.edu