Nonplanned

Part of speech: adjective

Definitions

1. A situation that occurs without prior organization or intent
2. An event that takes place unexpectedly without set preparation or forethought
3. Happening spontaneously without any prior arrangement or intention

Etymology: "Nonplanned" is simply the prefix "non-", meaning "not", attached to "planned", the past participle of "plan." Together they describe something that happens without prior arrangement or intention. The formation is transparent: "non-" has been productive in English for centuries, and "planned" carries the sense of having been arranged in advance, so the combination needs no special explanation. The word is most often used in contrast with its opposite, as in discussions of "nonplanned pregnancies" or "nonplanned stops" on a journey, where the hyphenless spelling has become common. Its meaning follows directly from its parts, with no shift from the original sense.

Synonyms: unplanned, spontaneous

Antonyms: planned, scheduled