## Etymology
From respond + -ive, from Latin responsus, past participle of respondere ('to answer'), from re- ('back') + spondere ('to promise, pledge').

## AI Etymology
Responsive comes from respond + -ive, from Latin responsus, past participle of respondere ('to answer'), from re- ('back') + spondere ('to promise, pledge'). The historical chain includes Latin respondere and Latin spondere. The quoted older senses, "to answer", "back", and "to promise, pledge", supply the semantic anchors for responsive. The formation is best read as suffixal, compound, participial, and borrowed: the word responsive carries its older form-history into a compact English lexical shape. In present English it is used as a adj, "reacting quickly and positively to something or someone". English derivatives include responsively and responsiveness; related English forms include respond, response, responsible, and spondee. The result is a adj whose etymology preserves both the older form and the later English specialization.

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- Describing Qualities
- Word Formation & Derivatives

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