Word family noun belief disbelief believer adjective believable ≠ unbelievable disbelieving verb believe ≠ disbelieve adverb unbelievably
From Longman Dictionary of Contemporary Englishdisbelievedis‧be‧lieve /ˌdɪsbəˈliːv/ verb [intransitive, transitive] formal BELIEVE#to not believe something or someone → doubt I see no reason to disbelieve him. —disbelieving adjective→ See Verb tableExamples from the Corpus
disbelieve• It was also a sign that William Mulholland chose, if not exactly to ignore, then to disbelieve.• Perhaps the best approach to reading a proof for the first time is positively to disbelieve each assertion made.• Kim, of course, disbelieved every word the boy said.• He had nothing to gain from lying so we saw no reason to disbelieve him.• The jury had no reason to disbelieve the witnesses. 