He turned out to be a rotten egg who couldn't keep his promises.
Он оказался никудышным человеком, который не мог сдержать свои обещания.
Definitions
A 'rotten egg' refers to an egg that has spoiled and emits a foul, sulfurous odor. The term can also be used informally to describe a person who behaves badly or mischievously.
