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English word assertive comes from English assert, English -ive
assert (English)
(computer science) To make true; to make equal to 1. (Can we add an example for this sense?). To declare with assurance or plainly and strongly; to state positively.. To maintain or defend, as a cause or a claim, by words or measures; to vindicate a claim or title to. To use or exercise and thereby prove the existence of. (computer science) an assertion; a section of source code which tests [...]
-ive (English)
An adjective suffix signifying relating or belonging to, of the nature of, tending to; as affirmative, active, conclusive, corrective, diminutive.
assertive (English)
Boldly self-assured; confident without being aggressive.