unpredictable

When something's unpredictable, it doesn't happen at expected times or it can't be predicted. If trains were unpredictable, they wouldn't follow a set schedule and you'd never know when one would arrive.

The adjective unpredictable can also describe something that's unexpected or not known in advance. Your soccer team's skill level might be wildly unpredictable — from game to game your coach never knows what you guys will do. It can be an insult if someone calls you an unpredictable person. That means people can't rely on you for things, such as consistently good work or keeping your promises.

DEFINITIONS OF: unpredictable

1

adj unknown in advance

“an unpredictable (or indeterminable) future”
Synonyms
indeterminable, undeterminable
not capable of being definitely decided or ascertained

adj not occurring at expected times

Synonyms:
irregular
sporadic
recurring in scattered and irregular or unpredictable instances

adj not capable of being foretold

Synonyms
uncertain
not certain to occur; not inevitable
aleatory
dependent on chance
capricious, freakish
changeable
episodic, occasional
occurring or appearing at usually irregular intervals
unforeseeable
incapable of being anticipated
Antonyms:
predictable
capable of being foretold
certain, sure
certain to occur; destined or inevitable
foreseeable
capable of being anticipated
inevitable
invariably occurring or appearing
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