: not predictable: such as
a
: not capable of being known before happening or being done
The weather has been completely unpredictable lately.
unpredictable results/behavior
b
: not always behaving in a way that is expected
He's very unpredictable. We never know what he'll do next.
Cite this Entry
“Unpredictable.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/unpredictable. Accessed 17 Apr. 2026.
Copy Citation
