紺|こんkon[1]atamadaka (head-high)

1. no-adjectivenavy blue; deep blue
   医者いしゃは紺こんのスーツの上うえに白衣はくいを着きていた。↗

   The doctor was wearing a white coat over a blue suit.

• SynonymネイビーNeutralLoanword for navy, used mostly for clothing, as in 「ネイビーのスーツ」; sounds more fashionable than 「紺」.
• Synonym濃紺のうこんNeutralAn even deeper navy, as in 「濃紺の制服」; the color is darker than 「紺」.
• SynonymダークブルーNeutralLoanword for dark blue; covers a slightly wider range of shades than 「紺」.
• RelatedネービーブルーNeutralLoanword for navy blue; the same color name as 「ネイビーブルー」, just spelled differently. 「紺」 is the native term and more common in daily use.
• Related濃紺色NeutralA dense, deep navy; synonymous with 「濃紺」 but with few examples in actual use.

Use 「紺」 for deep blue or navy, as in 「紺のスーツ」. For a still darker shade say 「濃紺」, and in fashion contexts 「ネイビー」 is the stylish choice; the loanwords ネービーブルー and ダークブルー also name similar blues.

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

1. （コン）深ふかみのある青あお。紺色こんいろ。