First opened Monday, December 6, 2010
深い
ふかい
- middle-high (nakadaka): falls after mora 2
How to read it: a line over a kana means the voice is high there, and ↓ marks where it drops. A kana with no line is low. With no ↓ the pitch stays high to the end and does not drop even on a following particle (が, は).
deep, profound
Fukai was fukashi in Early Middle Japanese, before its ending was replaced and the medial k fell out.
Taken apart
No breakdown is shown for this word: Wiktionary's text for it doesn't give a split that spells the word and joins to its reading, and any other split would be a guess.
Written with 深
In a sentence
この湖は深い。
This lake is deep.
彼女は慈悲深い。
She is merciful.
Sentences are from Tatoeba (CC BY 2.0 FR), picked by fixed rules from a dated export and shown unchanged. Nobody has reviewed them one by one.
What Wiktionary says
Quoted line by line from Wiktionary's Etymology section for this reading, taken from one dated dump so it can't change underneath us. Nothing below is paraphrased.
- “From Early Middle Japanese adjective 深(ふか)し (fukashi), with the 終(しゅう)止(し)形(けい) (shūshikei, “predicative form”) ending in し (shi) first replaced with the 連(れん)体(たい)形(けい) (rentaikei, “attributive form”) ending in き (ki), and then with the medial /-k-/ falling out to result in an ending of い (i). From Old Japanese. First attested in the Kojiki of 712 CE. From Proto-Japonic *puka.”
Source: Wiktionary: 深い (dump of 2026-09-02), available under CC BY-SA 4.0. Reading, meaning and part of speech from JMdict, and kanji readings from KANJIDIC2 (EDRDG).
Other readings of 深い on the same Wiktionary page
These describe other words written the same way, not ふかい. They are quoted for context: the parts, layer and processes of this word are not taken from them.
ぶかい
- “The fukai changes to bukai as an instance of rendaku (連濁).”
What the labels mean
- 和語 Native Japanese
- Words that were already Japanese before Chinese vocabulary arrived — usually written with kun'yomi and often short.