
Tito H. answered 04/29/19
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Communication focused tutor for Korean
You're right when saying 싱겁다 tends to have a negative connotation.
Based on how you explained it, I think the best way to phrase this is: "이 빵은 너무 느끼하지 않아서 좋아요."/"이 빵은 버터 맛이 많이 안 나서 좋아요."
Good look with your Korean studies!