vis (force): necessitas (constraint imposed by necessity): without any compulsion, voluntate (of one’s own free will; opposed to vi or invitus etcoactus); (the words are found in this connexion and order), judicio et voluntate. sponte: sua (tua, etc.) sponte (of one’s own accord, of one’s free will, ἑκουσίως); (the words are found in this connexion and order), sua, sponte et voluntate: I do anything by compulsion, vi coactus aliquid facio: to oblige a person by compulsion, aliquem vi cogere: aliquem per vim adigere. alicui necessitatem imponere or injicere to resort to compulsion, vim adhibere.