uninviting (adj.)

• abhorrent
• bitter
• disagreeable
• dislikable
• displeasing
• distasteful
• intolerable
• odious
• sour
• thankless
• ugly
• unappealing
• unappetizing
• unattractive
• uncongenial
• undesirable
• unlikable
• unlovable
• unpalatable
• unpleasant
• unpleasing
• unsavory
• unwelcome