keen-witted russian

• дога́дливый

  quick-witted, keen-witted, quick of apprehension, on the uptake, shrewd, penetrating

• смека́листый

  sharp, keen-witted

• сметли́вость

  sharpness, keen-wittedness, gumption

• сметли́вый

  sharp, keen-witted, quick on the uptake