Answer: offthecuff

AnswerCrossword Clue
OFFTHECUFFExtemporaneously
OFFTHECUFFAd-lib
OFFTHECUFFExtemporaneous
OFFTHECUFFWithout forethought
OFFTHECUFFImpromptu
OFFTHECUFFImprovised
OFFTHECUFFExtemporaneously: Slang.
OFFTHECUFFAd-lib.
OFFTHECUFFSpontaneous: Colloq.
OFFTHECUFFImprovised.