fallaciousness

WordReference Random House Learner's Dictionary of American English © 2025

fal•la•cious /fəˈleɪʃəs/   adj. 

1. logically unsound:
   fallacious arguments.
2. deceptive;
   misleading:
   fallacious testimony.

fal•la•cious•ly, adv. 

WordReference Random House Unabridged Dictionary of American English © 2025

fal•la•cious  (fə lā′shəs), adj. 

1. containing a fallacy;
   logically unsound:
   fallacious arguments.
2. deceptive;
   misleading:
   fallacious testimony.
3. disappointing;
   delusive:
   a fallacious peace.

• Latin fallāciōsus deceitful, deceptive. See fallacy, -ous
• 1500–10

fal•la′cious•ly, adv. 
fal•la′cious•ness, n.