Dictionary Definition :
Definition[1]
:
impromptu : (adv.) nirussāhena; anāyāsena.
Source
:
A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]
Related
:
improper , improper place , improper time , improperly , impropriate , improbity , improbable , improbability , imprisonment , imprison