Unwonted
Definition 1 of 1

Surprise Element
Use 'unwonted' to express an element of surprise due to rarity or unexpectedness in a situation or behavior.

The unwonted cheerfulness of the usually solemn professor took everyone by surprise.
Negative Context
'Unwonted' can be used to denote a negative deviation from someone's typical behavior or situation.

His unwonted outburst of anger left us all in shock.
Intensity Scale
When describing intensity, 'unwonted' suggests a level beyond what is normal, but not necessarily extreme.

After the speech, she felt an unwonted sense of importance among her peers.
Compare with
abnormalcommonalityexpectnovelpeculiarrarestrangeusual
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