先鋭・尖鋭|せんえいsen'ei[0]heiban (flat)

1. na-adjective, no-adjectiveradical; acute; sharp

• Synonym鋭利えいりWrittenWritten word for a sharp blade or a keen mind; 「先鋭」 more often describes thought or action turning radical and sharp.
• SynonymシャープNeutralLoanword for sharp, clear or keen, as in 「シャープな画像」; unlike 「先鋭」 it carries no sense of being radical.
• SynonymラジカルNeutralLoanword for radical or thorough, said of thought and politics; close in feel to 「先鋭」.
• Synonym過激かげきNeutralSuggests excessively extreme words or deeds and is derogatory, as in 「過激派」; 「先鋭」 stresses sharpness and radicalism.
• Synonym急進的きゅうしんてきWrittenWritten term for pushing reform rapidly, the opposite of gradualism; 「先鋭」 stresses a stance turning sharp.
• Synonym犀利さいりWrittenWritten word for physical sharpness or keen intellect, as in 「犀利な分析」; no radical nuance.
• Related鋭いするどいNeutralThe most general word for sharp or keen; 「先鋭」 is said of positions or conflicts intensifying.
• Related尖ったとがったCasualColloquial word for something literally pointed, or figuratively for cutting words and a boldly unconventional personality.
• Related矯激きょうげきWrittenWritten and rare: describes words and deeds that are extreme and eccentric; 「先鋭」 stresses a sharpening stance.
• Related詭激きげきWrittenWritten and rare, for extreme, eccentric behavior; in most cases 「過激」 is the natural choice.
• Antonym保守的ほしゅてきNeutralNeutral antonym: conservative and unadventurous, as in 「保守的な考え」, opposed to the radicalism of 「先鋭」.
• Antonym鈍重どんじゅうWrittenWritten antonym: dull and sluggish, the opposite of the keenness and sharpness of 「先鋭」.

For a sharp blade or keen senses use 「鋭い」 or 「鋭利」. 「先鋭」 describes thought, stances or conflict turning sharp and radical, as in 「先鋭化する」 or 「先鋭的な集団」. 「ラジカル」 and 「過激」 overlap but 「過激」 is critical; 「保守的」 is the conservative opposite.

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

1. 鋭するどく尖とがっていること。
2. 思想しそう・行動こうどうなどが急進的きゅうしんてきなこと。