Verbseoul.
르 irregular (adj)
서투르다seotureudato be unskillful, inexperienced, unhandy

To say to be unskillful, inexperienced, unhandy politely in the present tense, use 서툴러요 (suh-tool-ruh-yoh). Below is the full conjugation of 서투르다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
서툴러
suh-tool-ruh
서툴러요
suh-tool-ruh-yoh
서투릅니다
suh-too-reum-nee-dah
Past
서툴렀어
suh-tool-ruh-ssuh
서툴렀어요
suh-tool-ruh-ssuh-yoh
서툴렀습니다
suh-tool-ruh-sseum-nee-dah
Future
서투를 거야
suh-too-reul- -guh-yah
서투를 거예요
suh-too-reul- -guh-yae-yoh
서투를 겁니다
suh-too-reul- -guhm-nee-dah

Other useful forms

Command Polite (세요)
서투르세요
suh-too-reu-sae-yoh
Suggestion / Let's Polite (요)
서툴러요
suh-tool-ruh-yoh
Question Polite (요)
서툴러요?
suh-tool-ruh-yoh-?
Connective “and” — (고)
서투르고
suh-too-reu-goh
Conditional “if” — (면)
서투르면
suh-too-reu-myuhn
Noun form — (기)
서투름
suh-too-reum