unprepared

adjectives

without preparation; not prepared for

"unprepared remarks"; "the shock was unprepared"; "our treaty makers approached their immensely difficult problems unprepared"- R.E.Danielson

unprepared

antonym

prepared

is similar to

with little or no preparation or forethought

"his ad-lib comments showed poor judgment"; "an extemporaneous piano recital"; "an extemporary lecture"; "an extempore skit"; "an impromptu speech"; "offhand excuses"; "trying to sound offhanded and reassuring"; "an off-the-cuff toast"; "a few unrehearsed comments"

ad-lib, extemporaneous, extemporary, extempore, impromptu, off-the-cuff, offhand, offhanded, unrehearsed

is similar to

in response to an unforeseen need

"a spur-of-the-moment party"

spur-of-the-moment