-히

Etymology
.

Suffix

 * 1) -ly;

Usage notes
Generally speaking, is used for adjectives formed by. is used for all non- adjectives. can be used for both and is often interchangeable with other suffixes. However, there are exceptions.
 * Some 하다 adjectives lose the consonant entirely, taking  instead. In the prescriptive standard of Seoul Korean, this happens in the following situations:
 * If the non-하다 element ends in, 이 is always used.
 * If the non-하다 element ends in, 이 is often used.
 * A few 하다 adjectives only use and do not use . There is no predictable rule for them.
 * For a few adverbs, the 히 form is prescriptively used despite being derived from non-하다 adjectives. However, most of these words have fallen out of use in spoken Korean. Note also that certain adverbs which originate as contractions of longer adverbs may use 히 even when there is no corresponding 하다 adjective for the contraction, and that some Sino-Korean adverbs with 히 have lost their adjectival counterpart entirely.
 * In practice, many Seoul speakers will uniformly use 히 for all adverbs where the corresponding 하다 adjective remains current in the language.
 * For a few adverbs, the 히 form is prescriptively used despite being derived from non-하다 adjectives. However, most of these words have fallen out of use in spoken Korean. Note also that certain adverbs which originate as contractions of longer adverbs may use 히 even when there is no corresponding 하다 adjective for the contraction, and that some Sino-Korean adverbs with 히 have lost their adjectival counterpart entirely.
 * In practice, many Seoul speakers will uniformly use 히 for all adverbs where the corresponding 하다 adjective remains current in the language.
 * In practice, many Seoul speakers will uniformly use 히 for all adverbs where the corresponding 하다 adjective remains current in the language.