Without humor or expression of happiness; grave in manner or disposition / Important; weighty; not insignificant / Really intending what is said (or planned, etc); in earnest; not jocular or deceiving

(colloquial, dialect) In a serious manner; seriously.

solemn

Alternative form of jocoserious

Taking oneself too seriously, pretentiously and humorlessly convinced of one's own seriousness.

(informal) Intended as a joke but also containing truths meant for reflection later.

(transitive) To consider (something /what somebody is saying) important and meaningful.

(idiomatic) Directs attention to immediately preceding failed attempt at humor.

Misspelling of seriously.

(nonstandard) comparative form of serious: more serious