Unwonted (adjective)

Not accustomed or usual; unfamiliar, unaccustomed, unusual, rare, or extraordinary.

Origin:

Late 16th century; earliest use found in thomas nash (1567–c.1601), writer. from un- + wonted.

Examples:

1. The unwonted silence was a stark contrast to the usual bustling city sounds.
2. The unwonted warmth of the sun was a welcome change from the usual bitter cold.
3. The unwonted display of emotion was a shock to those who knew him as stoic and reserved.
4. The unwonted spectacle of auroras in the sky was a marvel to behold.
5. The unwonted flavor of the dish was a delightful surprise to the diners.