peaky

adj

1. Sickly; peaked.

   “Her appetite did not improve, however, and she looked very thin and peaky.”

2. Characterised by peaks.

   “Or over hills with peaky tops engrail'd, / And many a tract of palm and rice, / The throne of Indian Cama slowly sail'd / A summer fann'd with spice.”

   “A wide spread of possible outcomes will give a relatively flat distribution and so indicate a risky project. A narrow spread of results will give a very peaky graph and indicate a low risk project.”