Adjective unassertive has 2 senses
  1. unassertive - inclined to timidity or lack of self-confidence; "a shy unassertive person"
    Antonyms:
    assertive, cocky, emphatic, forceful
  2. unassertive, retiring - not blatant or overly aggressive in manner or appearance; "a retiring disposition"
    Antonyms: obtrusive, noticeable (indirect, via unobtrusive)
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