IPA: //nɒnəˈsɜːrtɪv//
KK: /nɑnəˈsɜrtɪv/
Not showing confidence or forcefulness in expressing opinions or desires.
She has a nonassertive personality, often avoiding confrontation.
Nonassertive → It is formed from "non-" (meaning not) and "assertive" (from Latin "assertivus", meaning inclined to assert or affirm). The word "nonassertive" means not inclined to assert oneself or lacking assertiveness.
Think of 'not' ('non-') being combined with someone who is 'affirming' or 'asserting' themselves — that's why nonassertive describes someone who does not assert themselves.