aggression

1 an inclination to fight or quarrel Japanese aggression in the years preceding the attack on Pearl Harbor had strained relations with the U.S. Synonyms belligerence, aggressiveness, assaultiveness, bellicosity, belligerency, combativeness, contentiousness, defiance, disputatiousness, feistiness, fight, militance, militancy, militantness, pugnacity, quarrelsomeness, scrappiness, truculenceRelated Words antagonism, fierceness, hostility, hyperaggressiveness, unfriendliness; imperialism, jingoism, militarism; acidity, biliousness, captiousness, crabbiness, crankiness, crossness, disagreeableness, fractiousness, fretfulness, grouchiness, grumpiness, huffiness, irascibility, irascibleness, irritability, irritableness, orneriness, peevishness, pettishness, petulance, querulousness, rudeness, surliness, testiness, waspishnessNear Antonyms antiaggression, anti-imperialism, antimilitarism; affability, amiability, amicability, benevolence, cordiality, friendliness, geniality, graciousness, pleasantness, sociability; gentleness, kindliness, mildness; amenability, complaisance, placabilityAntonyms nonaggression, pacifism

2 the act or action of setting upon with force or violence Japan's act of aggression—the attack on Pearl Harbor—brought the U.S. into World War II Synonyms attack, assault, attempt, blitz, blitzkrieg, charge, coup de main, descent, offense (or offence), offensive, onset, onslaught, raid, rush, strikeRelated Words ambuscade, ambush; counteraggression, counterassault, counterattack, counteroffensive, counterstrike; sally, sortie; envelopment, flanking; breakthrough, foray, incursion, invasion; pillage, ravage, sack; air raid, bombardment, bombing; siege, storm; barrage, cannonade, fusillade, hail, salvo, volley; whammyNear Antonyms defense, defensive, guard, shield; opposition, resistance; protection, security, shelter