This is the 2593rd most frequent Korean word.
불만이
"불만이" means "dissatisfaction" or "complaint" in English.
불만이 is used as a noun here to indicate 'complaints' or 'dissatisfaction'.
그는 회사 정책에 대해 불만이 많아요.
He has many complaints about the company policy.
불만이 was combined with the past tense verb 이에요/예요 to describe a state of past dissatisfaction.
학생들은 종종 선생님의 설명 방식에 불만이었어요.
The students were often dissatisfied with the teacher's explanation method.
불만이 is used here within a conditional clause to refer to 'having a complaint or dissatisfaction'.