unappetizing (adj.)

• bitter
• disagreeable
• dislikable
• displeasing
• distasteful
• flat
• flavorless
• insipid
• savorless
• sour
• tasteless
• thankless
• ugly
• unappealing
• unattractive
• undesirable
• uninviting
• unlikable
• unpalatable
• unpleasant
• unpleasing
• unsavory
• unwelcome