濃い|こいkoi[1]atamadaka (head-high)

1. i-adjectivedeep (colour); dark
   そのピアノは美うつくしい、濃こい褐色かっしょくの木きで作つくられていました。↗

   The piano was made of beautiful, dark brown wood.
2. i-adjectivestrong (flavour, smell, etc.)
   コーヒーはどんなふうにしましょうか。濃こいブラックがいいですか。↗

   How do you like your coffee? Strong and black?
3. i-adjectivethick (consistency); dense
   血ちは水みずよりも濃こし。↗

   Blood is thicker than water.
4. i-adjectivestrong (possibility, etc.)
5. i-adjectivethick (i.e. "as thick as thieves"); close; deep (love, etc.)

• Synonym濃厚のうこうNeutralRich in taste or colour, and also used for high likelihood, as in 「敗色濃厚」; more written in tone than 「濃い」.
• Related深いふかいNeutralAbout depth—physical, abstract, or in relationships—and deep colours like 「深い緑」; 「濃い」 instead stresses high concentration or density.
• Related濃密のうみつWrittenWritten-style word for high density or rich content, as in 「濃密な霧」 and 「濃密な時間」; it can also describe close relationships. 「濃い」 is the everyday choice.
• Related派手はでNeutralDescribes showy, eye-catching colours or dress, as in 「派手な服」; 「濃い」 only says a colour is deep or dark, never flashy.
• Related強烈きょうれつNeutralFor intense stimulation, as in 「強烈な匂い」 or 「強烈な印象」; the degree is fiercer than 「濃い」 implies.
• Related激しいはげしいNeutralDescribes violent force or momentum, as in 「激しい雨」; it is not used for how strong a colour or flavour is.
• RelatedきついCasualColloquial for smells, alcohol, etc. that hit hard, as in 「香水がきつい」; it carries a sense of discomfort that 「濃い」 lacks.
• Related稠密ちゅうみつWrittenFormal, mainly geographic term for densely packed people or buildings, as in 「人口稠密」; not used for colour, taste, or liquids.
• Related密みつNeutralCovers being dense or close-knit, as in 「連絡を密にする」; 「濃い」 is the word for the concentration of colour, taste, or liquids.
• RelatedどぎついCasualColloquial and negative, for colours or expression that are excessively loud or garish, as in 「どぎつい化粧」.
• Antonym薄いうすいNeutralThe direct opposite: pale colour, weak flavour, or thin, as in 「味が薄い」.
• Antonym淡いあわいNeutralFor pale colours or faint light, and hazy, faint feelings, as in 「淡い恋」; more elegant than 「薄い」.

Use 「濃い」 for deep colours, strong tastes and smells, and thick liquids. For richness or high likelihood pick 「濃厚」; for showy colour 「派手」; for intense stimulation 「強烈」 or 「きつい」; for the opposite, 「薄い」 or 「淡い」.

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

1. 溶液ようえき中ちゅうの溶質ようしつの量りょうが多おおいこと。濃度のうどや密度みつどが高たかい。
2. 味あじの総量そうりょうが多おおいこと。食品しょくひんに味付あじつけした調味料ちょうみりょうを強つよくかんじる。
3. 物事ものごと、人物じんぶつが印象的いんしょうてきであること。