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fallacious

fal·la·cious

fallacious

 
pronunciation:
f leI shs
features:
Word Parts
part of speech: adjective
definition: based on unsound logic; in error; illogical.
You've unfortunately based your essay on a fallacious argument.
antonyms:
correct, logical, sound
similar words:
illogical, irrational, mistaken, unsound
derivations: fallaciously (adv.), fallaciousness (n.)
Word Parts
The word fallacious contains the following parts:
fall, fals Latin root that means to deceive
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-acious Latin adjective-forming suffix that means full of, characterized by
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The suffix -acious forms adjectives from Latinate nouns ending in "-acity," "-acy," or "-ce." Most common adjectives ending in -acious have a corresponding noun form ending in "-acity."