Ironic
Part of speech: adjective
Definition: Both coincidental and contradictory in a humorous or poignant and extremely improbable way.
Example sentence: It is an ironic habit of human beings to run faster when we have lost our way.
Ironical
Part of speech: adjective
Definition: Pertaining to irony; conveying or consisting of covert sarcasm; sarcastic under a serious or friendly pretense; as, an ironical compliment.Addicted to irony; using disguised sarcasm.Feigning ignorance; simulating lack of instruction or knowledge (also known as Socratic Irony).