It was ironic that he forgot his own birthday.

Expressing a situation that is contrary to what is expected or intended.
She found it ironic that the weather was perfect on the day of the picnic.
It's ironic how he always complains about being late but never leaves on time.
They thought it was ironic that the safety features failed during the test.
ironic twist
ironic situation
ironic comment
sarcastic
mocking
satirical
It was ironic that it rained on their wedding day.

Describing a situation where the opposite of what is expected happens.
It's ironic that he forgot his umbrella on a rainy day.
She found it ironic that the chef burned the toast.
He thought it was ironic to win a prize for being late.
ironic twist
ironic situation
ironic comment
sarcastic
paradoxical
contradictory