Without preparation or advance thought; offhand
(Music) Using or consisting of sounds to be chosen by the performer or left to chance; indeterminate:
The definition of fortuitous is happening by chance.
Having no apparent external cause or influence; occurring or produced by its own energy, force, etc. or through internal causes; self-acting
Occurring without warning; unforeseen.
Not done on purpose
Due to oversight; unintentional
Presented between major radio or television programs:
Not intended; unintentional:
The definition of chance is accidental or not expected or planned.
Marked by a lack of care, accuracy, or organization; random.
Find another word for unplanned. In this page you can discover 25 synonyms, antonyms, idiomatic expressions, and related words for unplanned, like: impromptu, accidental, adventitious, planned, aleatory, fortuitous, haphazard, random, spontaneous, undesigned and unexpected.