Supportive

google

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Middle English (originally in the sense ‘tolerate’): from Old French supporter, from Latin supportare, from sub- ‘from below’ + portare ‘carry’.

wiktionary

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From support +‎ -ive.

etymonline

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supportive (adj.)

1590s, from support (v.) + -ive. Called "rare" in OED 1st edition and Century Dictionary. Related: Supportively; supportiveness.