Ironic (adjective)

1. Using words to convey a meaning that is opposite of its literal or usual meaning.
2. Containing or exemplifying irony.
3. Being or occurring in a way that is opposite of what is expected and often amusing as a result.

Origin:

From greek eirōn "dissembler, ironist".

Examples:

1. It is ironic that the fire station burned down.
2. The ironic tone of the song was not appreciated by the audience.
3. It is ironic that the rain started just as the picnic ended.
4. It is ironic that the teacher was absent on the day of the test.
5. The ironic ending of the story was not expected.