This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
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adj. Grave in quality or manner: gave me a serious look.

adj. Carried out in earnest: engaged in serious drinking; serious study of Italian.

adj. Deeply interested or involved: a serious card player.

adj. Designed for and addressing grave and earnest tastes: serious art; serious music.

adj. Not trifling or jesting: I'm serious: we expect you to complete the assignment on time. Her question was serious enough to deserve a thoughtful response.

adj. Informal Of considerable size or scope; substantial: a cleanup that cost serious money.

adj. Of such character or quality as to appeal to the expert, the connoisseur, or the sophisticate: "Every serious kitchen needs at least one peppermill” ( Washington Post).

adj. Concerned with important rather than trivial matters: a serious student of history.

adj. Being of such import as to cause anxiety: serious injuries; a serious turn of events.

adj. Too complex to be easily answered or solved: raised some serious objections to the proposal.

adj. Without humor or expression of happiness; grave in manner or disposition; earnest; thoughtful; solemn.

adj. Important; weighty; not trifling; leaving no room for play; needing great attention; critical.

adj. Really intending what is said; being in earnest; not jesting or deceiving; meaningful.

adj. Grave in manner or disposition; earnest; thoughtful; solemn; not light, gay, or volatile.

adj. Really intending what is said; being in earnest; not jesting or deceiving.

adj. Important; weighty; not trifling; grave.

adj. Hence, giving rise to apprehension; attended with danger.

Grave in feeling, manner, or disposition; solemn; earnest; not light, gay, or volatile; of things, springing from, expressing, or inducing gravity or earnestness of feeling.

In earnest; not jesting or making pretense.

Important; weighty; not trifling.

Attended with danger; giving rise to apprehension: as, a serious illness.

Deeply impressed with the importance of religion; making profession of or pretension to religion.

Synonyms Solemn, etc. See grave.

1 and Sedate, staid, sober, earnest.

Great, momentous.

adj. completely lacking in playfulness

adj. concerned with work or important matters rather than play or trivialities

adj. requiring effort or concentration; complex and not easy to answer or solve

adj. of great consequence

adj. appealing to the mind

adj. causing fear or anxiety by threatening great harm

"Pávlovna, there are things which must be investigated and fully understood before they can be talked about, things too serious, too serious  ..."

solemn    sobering    sincere    sober    overserious    earnest    sedate    grave    serious-minded    real   

trifling    unimportant    jesting   

sober    dangerous    important    deep    matter-of-fact   

weighty    solemn    important    earnest    sedate    grave    thoughtful   

deleterious    delirious    imperious    mysterious   

real    severe    significant    further