All serious synonyms

adj serious

• crucial — If you describe something as crucial, you mean it is extremely important.
• major — Clarence, born 1936, U.S. novelist and poet.
• grievous — causing grief or great sorrow: grievous news.
• dangerous — If something is dangerous, it is able or likely to hurt or harm you.
• deep — If something is deep, it extends a long way down from the ground or from the top surface of something.
• far-reaching — extending far in influence, effect, etc.: the far-reaching effect of his speech.
• urgent — compelling or requiring immediate action or attention; imperative; pressing: an urgent matter.
• important — of much or great significance or consequence: an important event in world history.
• significant — important; of consequence.
• tough — strong and durable; not easily broken or cut.
• meaningful — full of meaning, significance, purpose, or value; purposeful; significant: a meaningful wink; a meaningful choice.
• difficult — not easily or readily done; requiring much labor, skill, or planning to be performed successfully; hard: a difficult job.
• genuine — possessing the claimed or attributed character, quality, or origin; not counterfeit; authentic; real: genuine sympathy; a genuine antique.
• deliberate — If you do something that is deliberate, you planned or decided to do it beforehand, and so it happens on purpose rather than by chance.
• sincere — free of deceit, hypocrisy, or falseness; earnest: a sincere apology.
• thoughtful — showing consideration for others; considerate.
• honest — honorable in principles, intentions, and actions; upright and fair: an honest person.
• severe — harsh; unnecessarily extreme: severe criticism; severe laws.
• sober — not intoxicated or drunk.
• austere — If you describe something as austere, you approve of its plain and simple appearance.
• bound — Bound is the past tense and past participle of bind.
• businesslike — If you describe someone as businesslike, you mean that they deal with things in an efficient way without wasting time.
• contemplative — Someone who is contemplative thinks deeply, or is thinking in a serious and calm way.
• deadpan — Deadpan humour is when you appear to be serious and are hiding the fact that you are joking or teasing someone.
• determined — If you are determined to do something, you have made a firm decision to do it and will not let anything stop you.
• downbeat — the downward stroke of a conductor's arm or baton indicating the first or accented beat of a measure.
• earnest — serious in intention, purpose, or effort; sincerely zealous: an earnest worker.
• funereal — of or suitable for a funeral.
• grave — the grave accent.
• grim — stern and admitting of no appeasement or compromise: grim determination; grim necessity.
• intent — something that is intended; purpose; design; intention: The original intent of the committee was to raise funds.
• meditative — given to, characterized by, or indicative of meditation; contemplative.
• no-nonsense — not tolerating anything frivolous or trifling; firm and businesslike: a no-nonsense approach to money matters; a no-nonsense teacher with well-behaved classes.
• pensive — dreamily or wistfully thoughtful: a pensive mood.
• reflective — that reflects; reflecting.
• resolute — firmly resolved or determined; set in purpose or opinion: Her parents wanted her to marry, but she was focused on her education and remained resolute.
• sedate — calm, quiet, or composed; undisturbed by passion or excitement: a sedate party; a sedate horse.
• set — to put (something or someone) in a particular place: to set a vase on a table.
• solemn — grave, sober, or mirthless, as a person, the face, speech, tone, or mood: solemn remarks.
• staid — of settled or sedate character; not flighty or capricious.
• steady — firmly placed or fixed; stable in position or equilibrium: a steady ladder.
• stern — rear of boat
• weighty — having considerable weight; heavy; ponderous: a weighty bundle.
• go for broke — a simple past tense of break.
• long-faced — having an unhappy or gloomy expression; glum.
• resolved — firm in purpose or intent; determined.
• unsmiling — to assume a facial expression indicating pleasure, favor, or amusement, but sometimes derision or scorn, characterized by an upturning of the corners of the mouth.
• arduous — Something that is arduous is difficult and tiring, and involves a lot of effort.
• fateful — having momentous significance or consequences; decisively important; portentous: a fateful meeting between the leaders of the two countries.