adj. 25B6; adjective
Edward's tone was ironic : SARCASTIC, sardonic, dry, caustic, sharp, stinging, scathing, acerbic, acid, bitter, trenchant, mordant, cynical; mocking, satirical, scoffing, derisory, derisive, scornful; Brit. informal sarky.
it's ironic that I've ended up writing : PARADOXICAL, incongruous, odd, strange, peculiar, unexpected.
sincere.