Verbseoul.
ㅂ irregular (adj)

해롭다 conjugation (haeropda, to be harmful)

To say to be harmful politely in the present tense, use 해로워요 (hae-roh-wuh-yoh) · haerowoyo. Below is the full conjugation of 해롭다 across the three tenses and three everyday speech levels.

Grammar note (ㅂ irregular (adj)): ㅂ-irregular adjectives follow the same rule as ㅂ-irregular verbs: the ㅂ changes to 우 when a vowel suffix follows. 덥다 (to be hot) becomes 더워요; 쉽다 (to be easy) becomes 쉬워요. The ㅂ is kept intact before consonant suffixes: 덥고, 쉽지. See all ㅂ-irregular verbs →

Conjugation table

pron. = pronunciation guide  · RR = Revised Romanization

Highlighted = where the stem changes

TenseCasual (반말)Polite (요)Formal (합니다)
Present
해로워
hae-roh-wuh
haerowo
해로워요
hae-roh-wuh-yoh
haerowoyo
해롭습니다
hae-rohp-sseum-nee-dah
haeropsseumnida
Past
해로웠어
hae-roh-wuh-ssuh
haerowosseo
해로웠어요
hae-roh-wuh-ssuh-yoh
haerowosseoyo
해로웠습니다
hae-roh-wuh-sseum-nee-dah
haerowosseumnida
Future
해로울 거야
hae-roh-ool guh-yah
haeroul geoya
해로울 거예요
hae-roh-ool guh-yae-yoh
haeroul geoyeyo
해로울 겁니다
hae-roh-ool guhm-nee-dah
haeroul geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
해로우세요
hae-roh-oo-sae-yoh
haerouseyo
Suggestion / Let's Polite (요)
해로워요
hae-roh-wuh-yoh
haerowoyo
Question Polite (요)
해로워요?
hae-roh-wuh-yoh-?
haerowoyo?
Connective "and" — (고)
해롭고
hae-rohp-goh
haeropgo
Conditional "if" — (면)
해로우면
hae-roh-oo-myuhn
haeroumyeon
Progressive (고 있어요)
해롭고 있어요
hae-rohp-goh ee-ssuh-yoh
haeropgo isseoyo
Want to (고 싶어요)
해롭고 싶어요
hae-rohp-goh shee-puh-yoh
haeropgo sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
해로울 수 있어요
hae-roh-ool soo ee-ssuh-yoh
haeroul su isseoyo
Because / So (아/어서)
해로워서
hae-roh-wuh-suh
haerowoseo
Noun form — (기)
해롭기
hae-rohp-gee
haeropgi
Noun form — (음)
해로움
hae-roh-oom
haeroum