1. minimize, belittle, denigrate, derogate, disparage, belittle, pick at

usage: cause to seem less serious; play down; "Don't belittle his influence"

2. disparage, belittle, pick at, knock, criticize, criticise, pick apart

usage: express a negative opinion of; "She disparaged her student's efforts"

3. diminish, belittle, decrease, lessen, minify

usage: lessen the authority, dignity, or reputation of; "don't belittle your colleagues"

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See also: belittle (Dictionary)