nonassertive
no·nas·ser·tive
adjective
1.
not aggressively self-assured, though not necessarily lacking in confidence
- “she was quiet and nonassertive as she took control”
Origin
From non- + assertive.
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.