"unplanned" in the adjective sense
1. unplanned
without apparent forethought or prompting or planning
"an unplanned economy"
"accepts an unplanned order"
"an unplanned pregnancy"
"unplanned remarks"
2. unintentional, unplanned, unwitting
not done with purpose or intent
"an unintended slight"
"an unintentional pun"
"the offense was unintentional"
"an unwitting mistake may be overlooked"
Source: WordNet® (An amazing lexical database of English)
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