adj. 25B6; adjective PASSIVE, retiring, unforthcoming, submissive, unassuming, self-effacing, modest, humble, meek, unconfident, diffident, shy, timid, insecure; informal mousy.
bold.
UNASSERTIVE
Meaning of UNASSERTIVE in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012