untended

Capitalism is like a very powerful car, a remarkable machine that—left untended—will run right over a cliff.

Attached to each rookery was a pair of skua gulls, who swooped down and quickly flew off with any eggs left for a moment untended.

Of what use to any, the feeble flickering light upstairs, that must go out were it left for a moment untended?

Herds of horses were seen from time to time roaming untended over the country.