かっこいい・格好いい・格好良いkakkoii

1. i-adjective (よい/いい)attractive; good-looking; stylish; cool; smooth; neat; with-it; groovy
   彼かれ、スラッとしてて、格好かっこういいじゃない。↗

   Isn't he gorgeous? - So tall and smart-looking.

   あら、かっこよく決きめているわね。↗

   Wow, you're dressed to kill.

• SynonymおしゃれNeutralIt's about dress sense: fashionable and well put together, as in 「おしゃれな服」. Stylish dressing, but not necessarily cool or handsome.
• SynonymシックNeutralLoanword for understated elegance and refinement, often for clothes in subdued colors. It praises taste, not coolness.
• Synonym粋いきNeutralEdo-style chic: dashing, worldly and considerate, as in 「粋な計らい」. The focus is on a person's air and warmth.
• SynonymスマートNeutralLoanword covering a slim figure, smart dress or brisk, tidy conduct, and even clever handling as in 「スマートな対応」. Stresses neatness more than 「かっこいい」.
• SynonymハンサムNeutralLoanword for good looks, mostly men's, though 「ハンサムな女性」 is possible. It's about the face or a dashing air, not cool behavior.
• Synonym立派りっぱNeutralSplendid and imposing, as in 「立派な建物」. It stresses dignity and impressiveness.
• SynonymいいNeutralThe all-purpose 'good'. It doesn't single out looks or a cool air, as 「いい人」 shows.
• SynonymスタイリッシュNeutralLoanword for a sharp, modern look, mostly for design and outfits. More formal than 「かっこいい」.
• Synonym格好の良いかっこうのいいNeutralMuch the same meaning — good looks or appearance — but a more formal turn of phrase; in everyday speech people say 「かっこいい」.
• Related小粋こいきNeutralModestly chic and stylish with a playful, cheeky edge, as in 「小粋な店」.
• RelatedきれいNeutralPretty or clean — beauty and tidiness are the point. It carries none of the cool, dashing feel of 「かっこいい」.
• Related瀟洒しょうしゃWrittenWritten word for a crisp, refined, unpretentious style — buildings and furnishings as in 「瀟洒な洋館」, or dress and bearing as in 「瀟洒な身なり」.
• Related美しいうつくしいNeutralBeautiful, with a formal, literary tone; mostly for women or scenery. It has no hint of coolness or style.
• Related素敵すてきNeutralLovely, wonderful — common in speech and softer than 「かっこいい」; it stresses the charm that makes hearts flutter.
• Related魅力的みりょくてきNeutralAttractive, in a tone that leans written and evaluative, as in 「魅力的な人物」.
• Related端正たんせいNeutralWell-ordered features and proper, tidy conduct, as in 「端正な顔立ち」.
• RelatedグーCasualColloquial and dated: just 'good' or 'nice', with a thumbs-up feel.
• RelatedビューティフルNeutralLoanword for beautiful, heard mostly in ads and song lyrics; uncommon in daily speech.
• RelatedいなせNeutralThe gallant, dashing air of Edo men, as in 「鯔背な若者」. An old-fashioned word.
• Related見目良いみめよいWrittenWritten and dated word for a good-looking face. It concerns looks only and is not used in daily conversation.
• Related見目麗しいみめうるわしいWrittenElegant written word for lovely looks, mostly describing women. Not used in everyday speech.
• RelatedハイカラNeutralMeiji-era word for Western-style fashion; it now carries a retro, dated flavor.
• Related端麗たんれいWrittenFormal written word for regular, graceful features, as in 「容姿端麗」.
• Related麗しいうるわしいWrittenLiterary word for beautiful looks or a touching bond, for men and women alike, as in 「麗しい友情」. More archaic than 「かっこいい」 and never cool.
• Related洒落たしゃれたNeutralChic and tasteful, as in 「洒落たカフェ」. The focus is on style and taste.
• Related美麗びれいNeutralGorgeous, sumptuous beauty, leaning written; mostly for pictures and decoration, not for a person's air.
• RelatedアトラクティブNeutralLoanword for attractive, mostly in business contexts; rare in everyday talk.
• AntonymみっともないNeutralAntonym for a shameful, unsightly appearance — the opposite of the smart, presentable 「かっこいい」.
• Antonymかっこ悪いかっこわるいCasualColloquial antonym: unfashionable and uncool, the direct opposite of cool, good-looking 「かっこいい」.

Use 「かっこいい」 for a cool, good-looking person or a stylish move, as in 「かっこいい先輩」. For dress sense pick 「おしゃれ」, for a handsome face 「ハンサム」, for Edo-style chic 「粋」, for a slim, tidy figure or handling 「スマート」. 「素敵」 is a softer, everyday 'lovely', 「綺麗」 pretty or clean, 「立派」 splendid and imposing, and 「いい」 just 'good'. Written choices include 「瀟洒」, 「端麗」 and 「麗しい」. The opposites are 「かっこ悪い」 and 「見っともない」.

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

1. 姿形すがたかたちが素晴すばらしい。体裁ていさいがよい。