いい

Etymology 1
→ * → →  → * →  → * →

Ultimately a shift from, classical.

Adjective

 * 1)  good
 * 2)  enough, not wanted any more
 * 3)  ; can, may
 * 1)  ; can, may

Usage notes

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