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The Collaborative International Dictionary
Proclive

Proclive \Pro*clive"\, a. [L. proclivis sloping, inclined; pro forward + clivus hill: cf. F. proclive. See Declivity, and cf. Proclivous.] Having a tendency by nature; prone; proclivous. [R.]
--Mrs. Browning.

Wiktionary
proclive

a. Having a tendency by nature; prone; proclivous.