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unwonted (adj) not usual or expected.
When somebody shown unwonted anger they show unusual anger. Such anger is unexpected from them. Unwonted interest is interest, which a person does not usually show or is expected to show.
- He behaved with unwonted politeness. This unusual politeness from him surprised every one.
- He was behaving with unwonted pleasantness. He is not usually pleasant, and people do not expect him to be pleasant as he is hardly pleasant. There must be strong reason for it, every one felt.