DISBELIEVE
disbelieve, discredit
(verb) reject as false; refuse to accept
Source: WordNet® 3.1
Etymology
Verb
disbelieve (third-person singular simple present disbelieves, present participle disbelieving, simple past and past participle disbelieved)
To not believe; to exercise disbelief.
To actively deny (a statement, opinion or perception).
To cease to believe.
Antonyms
• believe
Source: Wiktionary
Dis`be*lieve", v. t. [imp. & p. p. Disbelieved; p. pr. & vb. n.
Disbelieving.]
Definition: Not to believe; to refuse belief or credence to; to hold not to
be true or actual.
Assertions for which there is abundant positive evidence are often
disbelieved, on account of what is called their improbability or
impossibility. J. S. Mill.
Source: Webster’s Unabridged Dictionary 1913 Edition