1. expressing meaning through the use of language signifying the opposite, typically for humorous or emphatic effect
2. happening in the opposite way to what is expected, and typically causing wry amusement because of this

Examples

• His ironic comment about the weather made everyone laugh.
• She gave an ironic smile when he said he was always on time.
• It's ironic that the fire station burned down.
• The ironic twist in the story surprised all the readers.
• How ironic that a professional swimmer drowned in the bathtub.
• His ironic tone suggested he didn't really mean what he said.
• The most ironic part was that she lost her keys while looking for them.