1) Badly chosen 2) Beside the point 3) Inapposite 4) Inappropriate 5) Inapt 6) Irrelevant 7) Like a confirmed nudist 8) No good 9) Not capable of being applied 10) Not fitting 11) Not suitable 12) Not worthy of being chosen 13) Out of place 14) Tactless 15) Unbecoming 16) Unfit 17) Unfitting 18) Unfortunate Found on https://www.crosswordclues.com/clue/unsuitable