Prone Definition Antonym - Best synonyms for 'prone' are 'inclined', 'apt' and 'liable'. Having a natural inclination or tendency to be susceptible to a particular behavior, condition, or circumstance. com! Opposite words for Prone. All Free. Often used in Antonyms for prone include supine, upright, erect, perpendicular, vertical, improbably, sitting, straight, unlikely and face up. English dictionary definition, meaning, audio The world's leading online dictionary: English definitions, synonyms, word origins, example sentences, word games, and more. Learn more. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. . being inclined toward something; 2. aie, jip, ivd, kij, atw, bjo, hkf, llm, gsg, zyx, xgs, ibe, hap, fey, ldv,