sharkish

From shark +‎ -ish.

sharkish (comparative more sharkish, superlative most sharkish)

1. Having shark-like characteristics, such as fierceness or agility.
   • 1851 November 14, Herman Melville, “His Mark”, in Moby-Dick; or, The Whale, 1st American edition, New York, N.Y.: Harper & Brothers; London: Richard Bentley, →OCLC, page 101:

     Pious harpooneers never make good voyagers—it takes the shark out of 'em; no harpooneer is worth a straw who aint pretty sharkish.

• Shirshak