(n.) One of the Selachii.

ambiguous amoral beguiling blank catchy conscienceless corrupt corrupted criminal crooked dark deadpan deceiving deceptive delusive delusory devious dishonest dishonorable doubtable doubtful dubious dubitable eellike empty equivocal evasive expressionless fallacious FALSE felonious fraudulent funny glassy hallucinatory ill-got ill-gotten illusive illusory immoral impassive implausible improbable indirect inexpressive insidious misleading not kosher odd peculiar piscatorial piscatory pisciform piscine poker-faced problematic queer questionable rotten selachian shady shameless sharkish shifty sinister slippery strange suspect suspicious trickish tricksy tricky uncertain unconscienced unconscientious unconscionable underhand underhanded unethical unexpressive unlikely unprincipled unsavory unscrupulous unstraightforward vacant without remorse without shame wooden