細い|ほそいhosoi[2]nakadaka (mid-high)

1. i-adjectivethin; slender; fine
   彼かれは太ふとっているくせに声こえは細ほそい。↗

   His voice is thin even though he is fat.
2. i-adjectiveunluckybilliards slang

• SynonymスリムCasualColloquial loanword for a slim figure; a positive evaluation, as in 「スリムな体型」.
• Synonym繊細せんさいWrittenWritten/formal. Delicate or sensitive, mostly for feelings and fine workmanship; not simply about physical thinness.
• Synonym華奢きゃしゃWrittenWritten/formal. Slender and elegant, for figures or delicate, flimsy objects; 「細い」 is just about thinness (or faintness) and lacks the graceful nuance.
• Synonym細めほそめNeutralSomewhat thin or on the narrow side, as in 「細めのパンツ」; a milder degree than 「細い」.
• Synonymか細いかぼそいNeutralThin and weak at once, as in 「か細い声」; stresses frailty and feebleness more strongly than 「細い」.
• Antonym太いふといNeutralThe direct antonym: thick or fat, and also used of a deep, sonorous voice.
• Antonym太ったふとったNeutralAntonym for the body-shape sense: describes a person as plump or having put on weight.

Use 「細い」 as the default for thin or slender. For slightly thin pick 「細め」, for a frail look 「か細い」, for slender elegance 「華奢」, for a slim figure 「スリム」; the opposite is 「太い」.

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

1. 胴回どうまわりの長ながさが小ちいさい。縦たてに比くらべ横よこの長ながさの小ちいさい。
2. 少すくない、か弱よわい、頼たよりない。