Unmistakable (adjective)

Impossible to mistake or misunderstand; clear and definite.

Origin:

Late middle english: from un- (expressing negation) + mistakable, from mistak- 'to mistake'.

Examples:

1. His writing style was unmistakable.
2. The evidence of her guilt was unmistakable.
3. The unmistakable smell of smoke filled the air.
4. The actor's distinctive voice made him unmistakable.
5. Her unmistakable talent on the piano impressed the audience.