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Webster 1913 Edition

Adj.

Having ready wit

Shak.

See also: quickwitted

quick-witted ‎(comparative more quick-witted, superlative most quick-witted)

Mentally keen, alert, sharp, agile, and nimble.
She was far too quick-witted to miss the implications of what he was saying.

mentally keen

German: geistesgegenwertig, schlagfertig (de)
Maori: atamai
Russian: поня́тливый (ru) ‎(ponjátlivyj), сообрази́тельный (ru) ‎(soobrazítelʹnyj), дога́дливый (ru) ‎(dogádlivyj), нахо́дчивый (ru) ‎(naxódčivyj)