過激|かげきkageki[0]heiban (flat)

1. na-adjective, nounextreme (measure, idea, etc.); radical; violent (language)
   彼かれの考かんがえは私には過激かげきすぎます。↗

   His ideas are too extreme for me.
2. na-adjective, nounstrenuous (exercise, work, etc.); excessive; (physically) demanding

• SynonymラジカルNeutralLoanword. Besides 'radical' it can mean fundamental or thorough. For everyday extreme speech or conduct, 「過激」 remains the usual choice.
• Synonym先鋭せんえいWrittenCovers sharp objects and, like 「過激」, radical thought or action — often as 「先鋭化」. In that sense the two are close, but this is more written in flavor.
• Related激しいはげしいNeutralThe everyday word for fierce force — rain, wind, emotion, competition. 「過激」 is narrower: thought, speech or exercise pushed past normal limits into the extreme.
• Related過度かどWrittenWritten style. Only excess beyond a proper degree, as in 「過度の飲酒」 — no violence or radicalism. 「過激」 stresses words, conduct or thought taken to extremes.
• Related猛烈もうれつNeutralStresses sheer force and momentum, and works adverbially as 'very', as in 「猛烈に勉強する」. 「過激」 is about straying from the norm, going to extremes.
• Related極端きょくたんNeutralLeans to one end rather than the middle; fits ideas, examples, even temperatures. 「過激」 implies excess intensity — radical views or punishing exercise.
• RelatedきついCasualColloquial. Tough work or training, tight clothes, harsh wording. Overlaps with 「過激」 on heavy strain and strong language, but no sense of radical thought.
• RelatedひどいCasualCommon in speech for cruelty, wretchedness or severe degree, strongly negative. 「過激」 is not necessarily bad — it stresses going too far, being extreme.
• Related極度きょくどWrittenWritten style. Degree at its very limit, usually modifying a state as in 「極度の疲労」. Unlike 「過激」, it does not describe speech or actions themselves.
• Related激甚げきじんWrittenWritten style for extreme intensity, mostly disasters and damage — 「激甚災害」 — also 「激甚な非難」. 「過激」 stresses straying from the norm into extremes.
• Related凄まじいすさまじいNeutralForce or degree so great it astonishes or frightens, for good or bad. 「過激」 only says radical or excessive, without that note of awe.
• Related激烈げきれつWrittenWritten style. Describes competition, argument or battle that is itself ferocious. It lacks the critical edge of 「過激」, which implies deviating from the norm.
• Related荒々しいあらあらしいWrittenWritten style. Rough, wild force in movements, character or waves. 「過激」 is about claims or degree going too far, not necessarily roughness.
• Related強烈きょうれつNeutralStrong stimulation, impressions or effects, as in 「強烈な印象」 and 「強烈な日差し」. It lacks 「過激」's sense of radicalism, of crossing the line.
• Related甚だしいはなはだしいWrittenWritten style for an extreme degree, mostly modifying negative things like misunderstanding or damage. Not used for radical thought or speech.
• RelatedどぎついCasualColloquial. Mostly colors, makeup or language so loud and garish they put people off. 「過激」 is about degree or claims going to extremes, not gaudiness.
• Related急進的きゅうしんてきWrittenWritten style. Radical in pushing reform, ideals or goals — mainly positions and lines. 「過激」 also covers movements and language, and is more pejorative.
• Related激越げきえつWrittenWritten style, mostly for impassioned, ringing tones and feelings, as in 「激越な口調」. 「過激」 is about content taken to extremes.
• Related凄絶せいぜつWrittenWritten style for battles or scenes gruesome and ghastly to the utmost, with a tragic tinge. That differs from the radical, over-the-line sense of 「過激」.
• Related凄烈せいれつWrittenWritten but rare; an overwhelming, intimidating fierceness. For everyday force say 「激しい」, for radical views say 「過激」.
• Antonym穏健おんけんWrittenAntonym. Moderate thought or stance that avoids extremes — 「穏健派」 vs 「過激派」. Mostly politics and positions.
• Antonym温和おんわNeutralAntonym. Mild in character, words and conduct, and said of climate too. It stands opposite 「過激」 in whether speech and behavior are intense.
• Antonym中庸ちゅうようWrittenAntonym. The middle way, leaning neither way, with a philosophical flavor — the direct opposite of 「過激」's extremism. Rare in daily speech.

Default to 「過激」 for thought, speech, conduct or exercise taken to extremes. For everyday fierce force — rain, wind, emotion — use 「激しい」; for pure excess, 「過度」; for severe degree, 「酷い」 in speech or 「甚だしい」 in writing. 「猛烈」 stresses sheer momentum (also adverbial), 「極端」 leaning to one end, 「強烈」 strong impressions, 「凄まじい」 astonishing force. For radical politics, 「急進的」 and 「先鋭」 are written alternatives; 「ラジカル」 also means fundamental. Colloquially, 「きつい」 covers tough strain. Antonyms: 「穏健」, 「温和」, 「中庸」.

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

1. 極きわめて激はげしいこと。
2. 思想しそうや態度たいどが極端きょくたんであること。
3. 性的せいてきに刺激しげきが強つよいこと。
4. 発言はつげんや行為こういなどが不穏当ふおんとうで乱暴らんぼうなこと。