Verbseoul.
하다 verb (adj)

딱딱하다 conjugation (ttakttakhada, to be hard, firm (resistant to pressure))

To say to be hard, firm (resistant to pressure) politely in the present tense, use 딱딱해요 (ttahg-ttah-kae-yoh) · ttakttakaeyo. Below is the full conjugation of 딱딱하다 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

TenseCasual (반말)Polite (요)Formal (합니다)
Present
딱딱해
ttahg-ttah-kae
ttakttakae
딱딱해요
ttahg-ttah-kae-yoh
ttakttakaeyo
딱딱합니다
ttahg-ttah-kahm-nee-dah
ttakttakamnida
Past
딱딱했어
ttahg-ttah-kae-ssuh
ttakttakaesseo
딱딱했어요
ttahg-ttah-kae-ssuh-yoh
ttakttakaesseoyo
딱딱했습니다
ttahg-ttah-kae-sseum-nee-dah
ttakttakaesseumnida
Future
딱딱할 거야
ttahg-ttah-kahl guh-yah
ttakttakal geoya
딱딱할 거예요
ttahg-ttah-kahl guh-yae-yoh
ttakttakal geoyeyo
딱딱할 겁니다
ttahg-ttah-kahl guhm-nee-dah
ttakttakal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
딱딱하세요
ttahg-ttah-kah-sae-yoh
ttakttakaseyo
Suggestion / Let's Polite (요)
딱딱해요
ttahg-ttah-kae-yoh
ttakttakaeyo
Question Polite (요)
딱딱해요?
ttahg-ttah-kae-yoh-?
ttakttakaeyo?
Connective "and" — (고)
딱딱하고
ttahg-ttah-kah-goh
ttakttakago
Conditional "if" — (면)
딱딱하면
ttahg-ttah-kah-myuhn
ttakttakamyeon
Progressive (고 있어요)
딱딱하고 있어요
ttahg-ttah-kah-goh ee-ssuh-yoh
ttakttakago isseoyo
Want to (고 싶어요)
딱딱하고 싶어요
ttahg-ttah-kah-goh shee-puh-yoh
ttakttakago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
딱딱할 수 있어요
ttahg-ttah-kahl soo ee-ssuh-yoh
ttakttakal su isseoyo
Because / So (아/어서)
딱딱해서
ttahg-ttah-kae-suh
ttakttakaeseo
Noun form — (기)
딱딱하기
ttahg-ttah-kah-gee
ttakttakagi
Noun form — (음)
딱딱함
ttahg-ttah-kahm
ttakttakam