1) Diffident 2) Nonaggressive 3) Nonassertive 4) Retiring 5) Shy 6) Submissive 7) Timid 8) Unaggressive 9) Unnoticeable 10) Unobtrusive 1) Nonaggressive 2) Nonassertive 3) Reticent 4) Self-effacing 5) Submissive 6) Timid 7) Unaggressive 
[adj] - not blatant or overly aggressive in manner or appearance 2. [adj] - inclined to timidity or lack of self-confidence
adjective inclined to timidity or lack of self-confidence; `a shy unassertive person`