Unaggressive means peaceful or agreeable. If your dog is sweet and friendly, you can describe her as unaggressive.

Someone who's unaggressive might fight, but never without being provoked. Generally, unaggressive people are mild-mannered peace lovers. Unaggressive things are equally gentle, like the unaggressive tone of your letter to the editor or the unaggressive background music you like to play when you're doing homework. Add the prefix un- ("not") to aggressive ("likely to attack") and you get unaggressive.

Definitions of unaggressive
  1. adjective
    not aggressive; not given to fighting or assertiveness
    synonyms: nonaggressive
    not forceful
    inclined to timidity or lack of self-confidence
    peaceable, peaceful
    not disturbed by strife or turmoil or war
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    having or showing determination and energetic pursuit of your ends
    battleful, bellicose, combative
    having or showing a ready disposition to fight
    competitive, militant
    showing a fighting disposition
    hard-hitting, high-pressure
    aggressively and persistently persuasive
    unsolicited and resisted by the management of the target company (used of attempts to buy or take control of a business)
    blatantly aggressive
    boisterously and noisily aggressive
    predatory, rapacious, raptorial, ravening, vulturine, vulturous
    living by preying on other animals especially by catching living prey
    pugnacious, rough
    ready and able to resort to force or violence
    full of fighting spirit
    defiantly aggressive
    assertive, self-asserting, self-assertive
    aggressively self-assured
    characterized by enmity or ill will
    for the purpose of attack rather than defense
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