IRONY

iro·ny /ˈaɪrəni/ noun

plural iro·nies

1 [noncount] : the use of words that mean the opposite of what you really think especially in order to be funny 
▪ a writer known for her clever use of irony ▪ “What a beautiful view,” he said, his voice dripping withirony, as he looked out the window at the alley. ▪ She described her vacation with heavy irony as “an educational experience.” — compare sarcasm

2 : a situation that is strange or funny because things happen in a way that seems to be the opposite of what you expected [count] ▪ It was a tragic irony that he made himself sick by worrying so much about his health. ▪ The (awful/bitter) irony is that in trying to forget her, he thought of her even more. ▪ That's just one of life's little ironies. [noncount] ▪ The irony of the situation was apparent to everyone. ▪ He has a strong sense of irony.