Verbseoul.
regular

실망시키다 conjugation (silmangsikida, to disappoint)

To say to disappoint politely in the present tense, use 실망시켜요 (sheel-mahng-shee-kyuh-yoh) · silmangsikyeoyo. Below is the full conjugation of 실망시키다 across the three tenses and three everyday speech levels.

Grammar note (regular): Regular verbs and adjectives conjugate predictably. Before 어-series suffixes, vowels may contract (가 + 아 → 가, 보 + 아 → 봐), but no consonant in the stem changes. If the final vowel of the stem is ㅏ or ㅗ, use 아; otherwise use 어. Consonant-final stems: 먹 + 어 → 먹어; vowel-final: 가 + 아 → 가.

Conjugation table

pron. = pronunciation guide  · RR = Revised Romanization

TenseCasual (반말)Polite (요)Formal (합니다)
Present
실망시켜
sheel-mahng-shee-kyuh
silmangsikyeo
실망시켜요
sheel-mahng-shee-kyuh-yoh
silmangsikyeoyo
실망시킵니다
sheel-mahng-shee-keem-nee-dah
silmangsikimnida
Past
실망시켰어
sheel-mahng-shee-kyuh-ssuh
silmangsikyeosseo
실망시켰어요
sheel-mahng-shee-kyuh-ssuh-yoh
silmangsikyeosseoyo
실망시켰습니다
sheel-mahng-shee-kyuh-sseum-nee-dah
silmangsikyeosseumnida
Future
실망시킬 거야
sheel-mahng-shee-keel guh-yah
silmangsikil geoya
실망시킬 거예요
sheel-mahng-shee-keel guh-yae-yoh
silmangsikil geoyeyo
실망시킬 겁니다
sheel-mahng-shee-keel guhm-nee-dah
silmangsikil geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
실망시키세요
sheel-mahng-shee-kee-sae-yoh
silmangsikiseyo
Suggestion / Let's Polite (요)
실망시켜요
sheel-mahng-shee-kyuh-yoh
silmangsikyeoyo
Question Polite (요)
실망시켜요?
sheel-mahng-shee-kyuh-yoh-?
silmangsikyeoyo?
Connective "and" — (고)
실망시키고
sheel-mahng-shee-kee-goh
silmangsikigo
Conditional "if" — (면)
실망시키면
sheel-mahng-shee-kee-myuhn
silmangsikimyeon
Progressive (고 있어요)
실망시키고 있어요
sheel-mahng-shee-kee-goh ee-ssuh-yoh
silmangsikigo isseoyo
Want to (고 싶어요)
실망시키고 싶어요
sheel-mahng-shee-kee-goh shee-puh-yoh
silmangsikigo sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
실망시킬 수 있어요
sheel-mahng-shee-keel soo ee-ssuh-yoh
silmangsikil su isseoyo
Because / So (아/어서)
실망시켜서
sheel-mahng-shee-kyuh-suh
silmangsikyeoseo
Noun form — (기)
실망시키기
sheel-mahng-shee-kee-gee
silmangsikigi
Noun form — (음)
실망시킴
sheel-mahng-shee-keem
silmangsikim