Flexible
来自Big Physics
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late Middle English: from Old French, or from Latin flexibilis, from flectere ‘to bend’.
wiktionary
From Middle French flexible, from Latin flexibilis, from flectō(“I bend, curve”).
Morphologically flex + -ible.
etymonline
flexible (adj.)
early 15c., "capable of being bent; mentally or spiritually pliant," from Old French flexible or directly from Latin flexibilis "that may be bent, pliant, flexible, yielding;" figuratively "tractable, inconstant," from flex-, past participle stem of flectere "to bend," which is of uncertain origin. Flexile (1630s) and flexive (1620s) have become rare. Related: Flexibly. Coles' dictionary (1717) has flexiloquent "speaking words of doubtful or double meaning."
