aggressor aggressiveness • aggrievance · · · Info · Definitions · Synonyms · Characters · · aggressor · · Text Latin · · Script 9 · · Length Definitions · · · (noun) someone who attacks. Synonyms: attacker, assailant, assaulter. · · Noun Definition 1 (noun) a confident assertive person who acts as instigator. · · Noun Definition 2 Synonyms · · · attacker · · Synonym 1 assailant · · Synonym 2 assaulter · · Synonym 3 Characters · · a latin small letter a U+0061 e latin small letter e U+0065 g latin small letter g U+0067 o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073