まず不味mazui
1.

Describing food or drink that has a disagreeable taste or flavor, making it unpalatable or undesirable to consume.

2.

Referring to a lack of skill or quality in a performance or creation, indicating clumsiness or ineptness.

3.

Expressing an uncomfortable or unfavorable condition for oneself, suggesting that the situation is not to one’s liking or is awkward.

4.

Characterizing someone's appearance as unattractive or unpleasing to look at, implying a lack of aesthetic appeal.

Example:

すき腹にまずいものなし。