- containing or involving a fallacy; illogical; erroneous
- tending to mislead
- delusive or disappointing
WordReference Random House Learner's Dictionary of American English © 2026
fal•la•cious /fəˈleɪʃəs/USA pronunciation
adj.
WordReference Random House Unabridged Dictionary of American English © 2026- logically unsound:fallacious arguments.
- deceptive;
misleading:fallacious testimony.
fal•la•cious
(fə lā′shəs),USA pronunciation adj.
fal•la′cious•ly, adv.
fal•la′cious•ness, n.
- containing a fallacy;
logically unsound:fallacious arguments. - deceptive;
misleading:fallacious testimony. - disappointing;
delusive:a fallacious peace.
- Latin fallāciōsus deceitful, deceptive. See fallacy, -ous
- 1500–10
fal•la′cious•ness, n.
Collins Concise English Dictionary © HarperCollins Publishers::
fallacious /fəˈleɪʃəs/ adj
'fallacious' also found in these entries (note: many are not synonyms or translations):
hysteron proteron
- petitio principii
- sophistry
- unsound
- -acious
- apatetic
- casuistry
- deceitful
- deceptive
- dialectic
- fallacy
- false
- illusory
- lying
- transcendental dialectic
- sophister
- sophistic
- sophistication
- subreption