良い

Etymology 1
Modern form of adjective.

(classical or terminal form) →  (classical  or attributive form) →  (modern shūshikei and rentaikei)

Adjective

 * 1) good

Usage notes

 * Most often written in hiragana. The kanji spelling is generally reserved for more formal writing.

Inflection

 * When with the suffix, it is  instead of.

Derived terms

 * , : bright, intelligent

Suffix

 * 1) easy

Usage notes

 * Most often written in hiragana. The kanji spelling is generally reserved for more formal writing.
 * Attaches to the of a verb. Example:
 * However, in modern Japanese, the adjective, is more commonly used to express this meaning.
 * However, in modern Japanese, the adjective, is more commonly used to express this meaning.

Etymology 2
Phonetic shift from the 🇨🇬 yoshi form of yoi above. Already in use as early as the Nihon Shoki, circa 720,  then becoming common in eastern Japanese from the. This form is now obsolete, though it may still be found in some dialects.

(classical or terminal form) →  (classical  or terminal form) →  (classical  or attributive form) →  (modern shūshikei and rentaikei)

Adjective

 * 1)  good

Etymology 3
Phonetic shift from ei above. This is now the most common form used in casual spoken Japanese.

→

Adjective

 * 1)  good
 * 2)  enough; not wanted any more.

Usage notes

 * Most often written in hiragana. The kanji spelling is generally reserved for more formal writing.
 * The ii form does not inflect — it is only used in the and  of ii. All other grammatical forms are based on the yoi form above. Compare the  yoku or the  yokatta: there is no *iku or *ikatta form.
 * In ironic usages denoting "very bad; embarrassing", the ii form is preferred to the yoi form.

Derived terms

 * , : bright, intelligent