1. expressing irony; using words to convey a meaning opposite to their literal meaning
Usage: often interchangeable with 'ironic' but less common
2. happening in a way that is opposite to what is expected; characterized by irony of situation
Usage: less common than 'ironic' for this sense

Examples

• His ironical comment about the weather made everyone laugh.
• She gave an ironical smile when he claimed to be an expert.
• It was ironical that the fire station burned down.
• The teacher's ironical tone suggested she didn't believe the excuse.
• How ironical that the health food store went out of business.
• His ironical remarks often confused people who took them literally.