Verbseoul.
하다 verb (adj)
날씬하다nalssinhadaslim, slender, lean, svelte

To say slim, slender, lean, svelte politely in the present tense, use 날씬해요 (nahl-sheen-hae-yoh). Below is the full conjugation of 날씬하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
날씬해
nahl-sheen-hae
날씬해요
nahl-sheen-hae-yoh
날씬합니다
nahl-sheen-hahm-nee-dah
Past
날씬했어
nahl-sheen-hae-ssuh
날씬했어요
nahl-sheen-hae-ssuh-yoh
날씬했습니다
nahl-sheen-hae-sseum-nee-dah
Future
날씬할 거야
nahl-sheen-hahl- -guh-yah
날씬할 거예요
nahl-sheen-hahl- -guh-yae-yoh
날씬할 겁니다
nahl-sheen-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
날씬하세요
nahl-sheen-hah-sae-yoh
Suggestion / Let's Polite (요)
날씬해요
nahl-sheen-hae-yoh
Question Polite (요)
날씬해요?
nahl-sheen-hae-yoh-?
Connective “and” — (고)
날씬하고
nahl-sheen-hah-goh
Conditional “if” — (면)
날씬하면
nahl-sheen-hah-myuhn
Noun form — (기)
날씬함
nahl-sheen-hahm