1. Without apparent forethought or prompting or planning
   "an unplanned economy"; "accepts an unplanned order"; "an unplanned pregnancy"; "unplanned remarks" 
2. Not done with purpose or intent
   - unintentional, unwitting

See also: ad hoc, casual, chance, unintended, unpremeditated

Antonym: planned

• thirster
• thirstily
• thirstiness
• thirsty
• thirteen
• thirteenth
• thirties
• thirtieth
• thirty
• Thirty Years' War
• thirty-eight
• thirty-eighth
• thirty-fifth
• thirty-first
• thirty-five
• thirty-four
• thirty-fourth
• thirty-nine
• thirty-ninth
• thirty-one
• thirty-second
• thirty-second note
• thirty-second part
• thirty-seven
• thirty-seventh