Real Dictionary

belittle
verb: If you belittle someone or something, you say or imply that they are unimportant or not very good.

belittle in American English
to make seem little, less important, etc.; speak slightingly of; depreciate
transitive verb: to regard or portray as less impressive or important than appearances indicate; depreciate; disparage

belittle in British English
to consider or speak of (something) as less valuable or important than it really is; disparage