Ответ:

  1. slim — the other words describe types of hair.
  2. arm — the other words are connected with the face.
  3. cheek — the other words are parts of the body below the neck.
  4. short — the other words describe weight or build.
  5. fair — the other words describe age.

Ответ: 1) slim; 2) arm; 3) cheek; 4) short; 5) fair.