Irresistible (adjective)

1. Too attractive or tempting to be refused or resisted.
2. Impossible to resist or overcome.

Origin:

From late latin irresistibilis, from in- ("not") + resistibilis ("that can be resisted"), from resistere ("to resist"). first recorded in english in the 1630s.

Examples:

1. The offer was irresistible, and he decided to take it.
2. The cake smelled irresistible and everyone wanted a piece.
3. Her beauty was irresistible and he fell in love with her instantly.
4. The young child's smile was irresistible and he couldn't help but return it.
5. The new game was irresistible to the kids and they played for hours.