say it: uh-SUR-tiv
assertive is an adjective meaning "aggressively self-assured". It carries one recorded sense.
aggressively self-assured
“an energetic assertive boy who was always ready to argue”
“pointing directly at a listener is an assertive act”
Definitions, synonyms and semantic relations for assertive come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.