unattractive (adj.)

• bitter
• blemished
• cacophonic
• cacophonous
• disagreeable
• disfigured
• dislikable
• displeasing
• distasteful
• dysphemistic
• homely
• inelegant
• marred
• plain
• sour
• spoiled
• thankless
• ugly
• unaesthetic
• unappealing
• unappetizing
• uncomely
• undesirable
• uninviting
• unlikable
• unlovely
• unpalatable
• unpleasant
• unpleasing
• unsavory
• unsightly
• unwelcome