素晴らしい|すばらしいsubarashii[4]nakadaka (mid-high)

1. i-adjectivewonderful; splendid; magnificent; amazing; superb
   その日ひは実じつにすばらしい日ひだった。↗

   It was a really beautiful day.
2. i-adjectiveexceeding; incredible; remarkable; striking; immenseadverbially as 素晴らしく

• Synonym素敵すてきNeutralCharming beauty that wins your heart; often praises looks or atmosphere with fondness, while 「素晴らしい」 stresses excellence that impresses.
• Synonym見事みごとNeutralPraises something done brilliantly — skill or results, as in 「見事な演技」; 「素晴らしい」 is broader admiration of excellence.
• Synonym立派りっぱNeutralFine, imposing or worthy of respect, as in 「立派な人」「立派な建物」; 「素晴らしい」 stresses being awe-inspiring.
• SynonymワンダフルCasualColloquial loanword for 'wonderful', often as an exclamation; in everyday speech 「素晴らしい」 is the usual choice.
• SynonymグーCasualColloquial slang from 'good' meaning 'not bad', with a playful feel.
• SynonymファンタスティックCasualColloquial loanword for 'fantastic': wonderfully dreamlike, often seen in advertising.
• Synonym秀逸しゅういつWrittenWritten/formal: exceptionally fine among its kind, mostly in reviews and criticism.
• Synonym良好りょうこうWrittenWritten/formal: in good condition, mostly in reports, as in 「経過良好」.
• Synonym華々しいはなばなしいWrittenWritten/formal: dazzling and conspicuous, as in 「華々しいデビュー」.
• Synonym目覚ましいめざましいWrittenWritten/formal: strikingly remarkable progress, as in 「目覚ましい成長」.
• SynonymいいCasualThe everyday colloquial 'good'; far short of the admiration 「素晴らしい」 conveys.
• RelatedきれいNeutralPretty or clean, focused on appearance, as in 「綺麗な花」; lacks the sense of excellence that impresses.
• Related良いよいNeutralA general 'good'; weaker in degree than 「素晴らしい」.
• Related美しいうつくしいNeutralBeautiful, centered on aesthetic appeal, as in 「美しい景色」.
• Related優秀ゆうしゅうWrittenWritten/formal: excellent in ability or results, as in 「優秀な学生」; mostly used to evaluate people.
• Related抜群ばつぐんNeutralFar above the rest, as in 「抜群の成績」; stresses outshining others.
• Related華やかはなやかNeutralGorgeous and eye-catching, stressing splendor, as in 「華やかな舞台」.
• Related格別かくべつWrittenWritten/formal: exceptionally good, with praise, as in 「格別の味」.
• Related輝かしいかがやかしいWrittenWritten/formal: brilliant, mostly for abstract achievements, as in 「輝かしい実績」.
• Related上等じょうとうNeutralTop quality, stressing the grade of goods, as in 「上等な肉」.
• Related最高さいこうNeutralThe best or greatest, common in speech, as in 「最高の一日」.
• Related堂々どうどうNeutralDignified and imposing, stressing presence, as in 「堂々とした態度」.
• Related優れたすぐれたNeutralOutstanding compared with others; mostly used before nouns, as in 「優れた才能」.
• Related麗しいうるわしいWrittenWritten/formal prose with an old-fashioned air: lovely and moving, or warm affection between people.
• AntonymひどいNeutralAntonym: as 「酷い」, stresses cruel means and cold treatment, far stronger than plain 'bad'.
• AntonymつまらないNeutralAntonym: dull and boring, lacking any appeal.
• AntonymむごいNeutralAntonym: scenes too tragic to watch, or mercilessness toward people.

For 'wonderful, amazing' in general, 「素晴らしい」 is the default. Use 「素敵」 for charm you feel fond of, 「見事」 for brilliant skill or results, 「立派」 for impressive and worthy of respect, 「抜群」 for far outshining others, 「最高」 for the best, and 「目覚ましい」 for striking progress; the opposite, dull and boring, is 「つまらない」.

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

1. 誰だれもが感心かんしんするほどにすぐれている。
2. （連用形れんようけいで副詞ふくし的てきに）程度ていどがはなはだしい様子ようす。