The word "invectively" is an adverb that describes someone speaking or writing with strong, insulting language. Synonyms for this word include words like abusively, insultingly, or vituperatively. These words all convey the same sense of someone using harsh language to hurt, belittle, or attack others. Other synonyms for invectively include offensively, aggressively, or venomously. Using these synonyms can help to add variety to your writing or speech and can help you to convey your message more effectively by choosing words that are appropriate for the tone and the audience.