unplanned (adj.)

• ad-lib
• aimless
• desultory
• extemporaneous
• haphazard
• hasty
• hit-or-miss
• impromptu
• improvised
• inadvertent
• indiscriminate
• involuntary
• makeshift
• precipitate
• purposeless
• rough-and-ready
• surprised
• unconscious
• unconsidered
• uncontrived
• undesigned
• unguarded
• unguided
• unhatched
• unintended
• unintentional
• unmade
• unorganized
• unpremeditated
• unprepared
• unprompted
• unready
• unstudied
• unthinking
• unthought
• unthought-of
• unwitting