무효해
moo-hyoh-hae
muhyohae
무효하다
To say ineffective, invalid politely in the present tense, use 무효해요 (moo-hyoh-hae-yoh) · muhyohaeyo. Below is the full conjugation of 무효하다 across the three tenses and three everyday speech levels.
Grammar note (하다 verb (adj)): 하다 adjectives use the same verb 하다 as a suffix to turn descriptive nouns into predicates (행복하다 = to be happy). They conjugate identically to 하다 verbs: the 하 contracts before -아/-어 suffixes to give 해. 행복해요, 행복했어요, 행복합니다. See all 하다 verbs →
Conjugation table
pron. = pronunciation guide · RR = Revised Romanization
Highlighted = where the stem changes
| Tense | Casual (반말) | Polite (요) | Formal (합니다) |
|---|---|---|---|
| Present | 무효해요 moo-hyoh-hae-yoh muhyohaeyo | 무효합니다 moo-hyoh-hahm-nee-dah muhyohamnida | |
| Past | 무효했어 moo-hyoh-hae-ssuh muhyohaesseo | 무효했어요 moo-hyoh-hae-ssuh-yoh muhyohaesseoyo | 무효했습니다 moo-hyoh-hae-sseum-nee-dah muhyohaesseumnida |
| Future | 무효할 거야 moo-hyoh-hahl guh-yah muhyohal geoya | 무효할 거예요 moo-hyoh-hahl guh-yae-yoh muhyohal geoyeyo | 무효할 겁니다 moo-hyoh-hahl guhm-nee-dah muhyohal geomnida |
Other useful forms
Honorific / Command Polite (-(으)세요)
무효하세요
moo-hyoh-hah-sae-yoh
muhyohaseyo
Suggestion / Let's Polite (요)
무효해요
moo-hyoh-hae-yoh
muhyohaeyo
Question Polite (요)
무효해요?
moo-hyoh-hae-yoh-?
muhyohaeyo?
Connective "and" — (고)
무효하고
moo-hyoh-hah-goh
muhyohago
Conditional "if" — (면)
무효하면
moo-hyoh-hah-myuhn
muhyohamyeon
Progressive (고 있어요)
무효하고 있어요
moo-hyoh-hah-goh ee-ssuh-yoh
muhyohago isseoyo
Want to (고 싶어요)
무효하고 싶어요
moo-hyoh-hah-goh shee-puh-yoh
muhyohago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
무효할 수 있어요
moo-hyoh-hahl soo ee-ssuh-yoh
muhyohal su isseoyo
Because / So (아/어서)
무효해서
moo-hyoh-hae-suh
muhyohaeseo
Noun form — (기)
무효하기
moo-hyoh-hah-gee
muhyohagi
Noun form — (음)
무효함
moo-hyoh-hahm
muhyoham