深い|ふかいfukai[2]nakadaka (mid-high)

1. i-adjectivedeep
   湖みずうみの深ふかさはどのくらいですか。↗

   What is the depth of the lake?
2. i-adjectiveprofound
3. i-adjectivedense; thick
4. i-adjectiveclose (relationship)
5. i-adjectiveintense; strong
6. i-adjectivelate

• Synonym奥深いおくふかいWrittenWritten. For being deep inside something, or for meanings that are profound and hard to grasp, as in 「奥深い森」「奥深い思想」; stresses hidden depth more than 「深い」.
• Synonym深遠しんえんFormalFormal. Describes thought or principles as far-reaching and unfathomable, e.g. 「深遠な哲学」; used mostly with abstract subjects.
• Synonym深奥しんおうWrittenWritten. For things too profound to fathom, or the innermost depths, as in 「学問の深奥」.
• Related濃いこいNeutralNeutral. For dark colours and strong flavours, e.g. 「濃い色」; 「深い」 is about depth instead.
• Related深甚しんじんFormalFormal. A written word for deep gratitude or respect, as in 「深甚なる謝意」.
• Related奥妙おうみょうWrittenWritten. Means something profound and mysterious; very rare, with 「奥深い」 the everyday choice.
• Related木深いこぶかいWrittenWritten. For deep, dense woodland; literary in flavour, and used only of forests.
• Related甚深じんしんFormalFormal Buddhist term for what is extremely profound; seen mostly in sutras.
• Related玄妙げんみょうWrittenWritten. For what is profound and subtle with a touch of mystery, as in 「玄妙な世界」.
• Related考え深いかんがえぶかいNeutralNeutral. Describes a person who thinks things over carefully and deeply; about character, as in 「考え深い人」.
• Antonym浅いあさいNeutralAntonym of 「深い」: shallow, and by extension superficial, as in 「浅い考え」.

「深い」 is the default for deep, in space or in thought. Use 「奥深い」 for hidden, hard-to-grasp depth, 「深遠」 for far-reaching ideas, 「濃い」 for dark colours and strong flavours, 「深甚」 for deep gratitude, and 「浅い」 as the opposite. The rarer words (深奥, 奥妙, 木深い, 甚深, 玄妙) are literary or formal; 「考え深い」 describes a thoughtful character.

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

1. 入り口いりぐちからの奥行おくゆきがある。底そこまでの距離きょりが長ながい。
2. 物事ものごとの奥底おくそこまで考かんがえられている。
3. 色いろが濃こい。
4. 親密しんみつだ。
5. 深ふかい井戸いど。