Antonym: believe. Similar words: it is believed that, believe, believe in, relieve, believable, relieved, unbelievable, belief. Meaning: [‚dɪ'sbɪ'lɪːv] 
v. reject as false; refuse to accept.
v. reject as false; refuse to accept. 
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31) I was forced to disbelieve in the existence of God.
32) Palestinians therefore utterly disbelieve American protestations of even - handedness.
More similar words: it is believed that, believe, believe in, relieve, believable, relieved, unbelievable, belief, misbehave, disband, sieve, grieve, achieve, reprieve, relief, aggrieved, belittle, white lie, achievement, hit below the belt, never-never, medieval, grievance, belt, bell, achievable, lie, below, rebel, belch.