–verb (used without object)
1. (of unpleasant feelings, experiences, etc.) to continue to cause keen irritation or bitter resentment within the mind; fester; be painful.
–verb (used with object)
2.to cause keen irritation or bitter resentment
what thesaurus.com says about this word:
synonyms: aggravate, embitter, fester, nettle, pester, plague
antonyms: assuage, delight, please