Nouns

(n)wildcat well, wildcatan exploratory oil well drilled in land not known to be an oil field
(n)beast, wolf, savage, brute, wildcata cruelly rapacious person
(n)wildcatany small or medium-sized cat resembling the domestic cat and living in the wild

Adjectives

(s)wildcatoutside the bounds of legitimate or ethical business practices“wildcat currency issued by irresponsible banks”, “wildcat stock speculation”, “a wildcat airline”, “wildcat life insurance schemes”
(s)unauthorized, unauthorised, wildcatwithout official authorization“an unauthorized strike”, “wildcat work stoppage”
(s)wildcat(of a mine or oil well) drilled speculatively in an area not known to be productive“drilling there would be strictly a wildcat operation”, “a wildcat mine”, “wildcat drilling”, “wildcat wells”