unprepared (adj.)
- ad-lib
- advanced
- airy
- amateurish
- asleep
- careless
- casual
- cursory
- degage
- dumbfounded
- easygoing
- extemporaneous
- flippant
- forgetful
- forward
- half-baked
- haphazard
- hasty
- heedless
- ill-considered
- impromptu
- improvised
- impulsive
- incautious
- incomplete
- inconsiderate
- indifferent
- insouciant
- lazy
- makeshift
- napping
- nodding
- oblivious
- off-guard
- offhand
- overhasty
- perfunctory
- precipitate
- precocious
- premature
- previous
- reckless
- regardless
- rough-and-ready
- rushed
- semiskilled
- sleeping
- surprised
- tactless
- thoughtless
- unadvised
- unalert
- unaware
- uncompleted
- uncontrived
- uncrystallized
- undiplomatic
- unendowed
- unfinished
- unguarded
- unhatched
- unheeding
- uninformed
- uninitiated
- unmade
- unmindful
- unorganized
- unplanned
- unpolished
- unpremeditated
- unprofessional
- unready
- unripe
- unschooled
- unskilled
- unstudied
- unsuspecting
- untactful
- untalented
- untaught
- unthinking
- untimely
- untrained
- untutored
- unvigilant
- unwary
- unwatchful
