Characterized by or constituting (any kind of) irony.
Done in an insincere and mocking manner; satirical.
Acting in a unserious and teasing manner.
Odd or coincidental; strange.
Without humor or expression of happiness; grave in manner or disposition
Committed.
Really intending what is said (or planned, etc); in earnest; not jocular or deceiving
Important; weighty; not insignificant
In a serious manner; seriously.