凄まじい|すさまじいsusamajii[4]nakadaka (mid-high)

1. i-adjectiveterrible; dreadful; awful; horrible; ghastly
2. i-adjectivetremendous; terrific; enormous; prodigious; stupendous; amazing
   国内市場こくないしじょうの競争きょうそうはすさまじいものです。↗

   Competition in the domestic market is cutthroat.
3. i-adjectiveappalling; shocking; staggering; absurd

• SynonymものすごいCasualColloquial; stresses a degree that simply astonishes, while 「凄まじい」 stresses extraordinary intensity and leans toward written style.
• SynonymすごいCasualThe most common colloquial word for 'amazing' or 'terrible', positive or negative; far lighter in tone than 「凄まじい」.
• SynonymひどいNeutralFor something excessive or terrible; stresses how bad or cruel it is and carries disapproval, not overwhelming force.
• Synonym恐ろしいおそろしいNeutralFrightening, and colloquially also 'amazingly'; the focus is the fear something inspires.
• Synonym強烈きょうれつNeutralIntense; stresses the shock of impact, as in 「強烈な印象」, without any fearsome note.
• Synonym激烈げきれつWrittenWritten style for extreme fierceness — competition, disputes, pain, emotion, change — as in 「激烈な競争」; not fearsome.
• Synonym甚だしいはなはだしいWrittenWritten style; marks an extreme degree, mostly with negative things, as in 「甚だしい誤解」.
• Synonym絶大ぜつだいWrittenWritten style; immense, mostly modifying popularity or trust and leaning positive; no fearsome note.
• Synonym猛烈もうれつNeutralFierce; stresses surging momentum, as in 「猛烈な勢い」; fairly neutral in tone.
• SynonymおぞましいNeutralHair-raising and repulsive; stresses a visceral, physical sense of disgust.
• SynonymおっかないCasualColloquial, mainly in eastern Japan, for something scary; stresses feeling afraid, not overwhelming force.
• Related激しいはげしいNeutralThe most broadly applicable word for intense or violent; it lacks the fearsome coloring of 「凄まじい」.
• RelatedきついCasualColloquial for tough or harsh; stresses being hard to bear, as in 「きつい仕事」.
• Related怖いこわいNeutralThe everyday word for scary; stresses one's own subjective sense of fear.
• Related荒々しいあらあらしいNeutralRough and wild; stresses coarse, violent movement or character, as in 「荒々しい波」.
• Related深刻しんこくNeutralSerious or grave; stresses how acute a problem or situation has become, not sheer force.
• Related大変たいへんNeutral'Very' or 'serious'; works in both speech and writing and is broad, but milder than 「凄まじい」.
• Related痛烈つうれつNeutralScathing; stresses the sharpness of criticism or attacks, as in 「痛烈な批判」.
• Related荒いあらいNeutralRough and uncontrolled, as in 「波が荒い」「金遣いが荒い」.
• RelatedむごいNeutralCruel and ghastly; stresses scenes too pitiful to watch, not fierce momentum.
• Relatedもの恐ろしいものおそろしいWrittenWritten style; a vague, unaccountable dread, stressing an eerie, sinister atmosphere.
• RelatedおどろおどろしいNeutralEerie and luridly exaggerated; stresses a deliberately unsettling, horror-laden atmosphere.
• RelatedこっぴどいCasualColloquial for 'severely', often 「こっぴどく叱られる」; stresses the harshness of a scolding.
• RelatedどぎついNeutralGarish and glaring; stresses an unpleasantly strong, overpowering effect.
• RelatedむごたらしいNeutralShockingly cruel; highlights the horrific scene itself, not the force behind it.
• Antonym穏やかおだやかNeutralCalm and gentle; the direct opposite of the fearsome, violent 「凄まじい」.

Use 「凄まじい」 for extraordinary, even fearsome intensity, as in 「凄まじい音」「凄まじい努力」. For everyday 'amazing' say 「凄い」 or 「物凄い」; for scary, 「恐ろしい」 or 「怖い」; for horrific scenes, 「むごい」; for fierce momentum, 「猛烈」. 「激しい」 covers intensity broadly without the fearsome shade, 「大変」 is a lighter all-rounder, and the antonym is 「穏やか」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. （限定的げんていてき）程度ていどが甚はなはだしく、恐怖きょうふを感かんじさせる。凄惨せいさんだ。
2. （汎用的はんようてき：好悪こうおを問とわず）程度ていどが並外なみはずれている。
3. 気分きぶんが沈しずんでいる。熱意ねついが出でない。
4. 殺風景さっぷうけいである。
5. さむざむしい。
6. よそよそしい。