Reckless
Thoughtless, Unpremeditated
noun, な adjective
むぼう
無闇に （むやみに） Thoughtlessly, Unreasonably, Recklessly, Absurdly
無謀 （むぼう） Reckless, Thoughtless, Unpremeditated
Transporting a moo む (cow) in a boat ぼう is Reckless.