Antonyms of adj assertive

1 sense of assertive

Sense 1
assertive (vs. unassertive), self-asserting, self-assertive -- (aggressively self-assured; "an energetic assertive boy who was always ready to argue"; "pointing directly at a listener is an assertive act")

unassertive (vs. assertive) -- (inclined to timidity or lack of self-confidence; "a shy unassertive person")
        => nonassertive -- (not aggressively self-assured, though not necessarily lacking in confidence; "she was quiet and nonassertive as she took control")
        => reticent, self-effacing, retiring -- (reluctant to draw attention to yourself)

Similarity of adj assertive

1 sense of assertive

Sense 1
assertive (vs. unassertive), self-asserting, self-assertive -- (aggressively self-assured; "an energetic assertive boy who was always ready to argue"; "pointing directly at a listener is an assertive act")
       => cocky -- (overly self-confident or self-assertive; "a very cocky young man")
       => emphatic, forceful -- (forceful and definite in expression or action; "the document contained a particularly emphatic guarantee of religious liberty")
          Also See-> aggressive#1; imperative#1