Synonyms of unpremeditated in English:

unpremeditated


See US English definition of unpremeditated

See UK English definition of unpremeditated

adjective

1‘her unpremeditated reply’

SYNONYMS
unplanned, spontaneous, unprepared, unarranged, uncontrolled, unintentional, unintended, extempore, extemporary, extemporized, extemporaneous, impromptu, ad lib
spur-of-the-moment, on-the-spot, improvised, improvisatory, unrehearsed, unscripted, unstudied, uncontrived, casual
impulsive, hasty, unthinking, natural, involuntary, automatic
ad libitum
informal off-the-cuff
ANTONYMS

premeditated, planned