agile

The word 'agile' entered English in the late 15th century from the French 'agile', which itself derives from the Latin 'agilis', meaning 'nimble, quick'. The Latin root is 'agere', a verb with the core sense of 'to drive, lead, act, or do'. This root is traceable to the Proto-Indo-European base ag- (to drive, draw out or forth, move). The semantic logic is clear: from the ancient concept of setting something in motion or taking action, the adjective 'agile' evolved to describe a quality of being capable of quick, effective action, whether physical or mental. The suffix '-ile' consistently forms adjectives indicating ability or tendency.

Structure: ag (to drive, to do) + ile (adjective suffix) 'ag' is from Latin 'agere' (to drive, to do, to act). 'ile' is a Latin adjectival suffix meaning 'pertaining to, capable of'.