slam-bang

in a careless or reckless manner

• “the shelves were put up slapdash”

with heedless speed

• “yachts ran slap-bang into the convoy at 15 knots an hour”

in a violent or sudden or noisy manner

• “the pans fell slam-bang and woke the whole house”

violent and sudden and noisy

• “a slam-bang collision”