Definitions for unplanned
Random House Webster's College Dictionary
without apparent forethought or prompting or planning
"an unplanned economy"; "accepts an unplanned order"; "an unplanned pregnancy"; "unplanned remarks"
unintentional, unplanned, unwitting(adj)
not done with purpose or intent
"an unintended slight"; "an unintentional pun"; "the offense was unintentional"; "an unwitting mistake may be overlooked"
unintentional; not intended
spontaneous and not thought through in advance
not having any structure or organization