결심이 · 결심을
determination, resolution, decision
Example
저는 올해 꼭 담배를 끊기로 결심했어요.
I've made up my mind to quit smoking for sure this year.
Word parts
결 decide+심 heart
Literally 'decide in the heart'.
Good to know
결심하다 usually takes -기로: 운동하기로 결심했어요 'I decided to exercise.'
Related words