unplanned
[adjective]
Synonyms: random, aimless, designless, desultory, haphazard, hit-or-miss, indiscriminate, purposeless, unaimed, unconsidered, unintentional, inadvertent, undesigned, undevised, unintended, unpremeditated, unpurposed, unthought

---

Antonyms: planned

[TahlilGaran] English Synonym Dictionary ▲

un‧planned /ˌʌnˈplænd◂/ adjective
[Word Family: noun: plan, planner, planning; verb: plan; adjective: planned ≠ unplanned]
not planned or expected:
an unplanned pregnancy

[TahlilGaran] Dictionary of Contemporary English ▲