stumbler

There was an immediate crackle and burst of static electricity, and the stumbler fell back yelping and shaking his arms.

Matey was good at lessons, too—liked them; liked Latin and Greek; would help a poor stumbler.

A bearing-rein may assist in keeping him on his feet, but an habitual stumbler can never be considered safe.

The lane is such a long one, and your father was always a sad stumbler in the dark!

His keen instinct for a fellow-stumbler was the only instinct he had not deliberately blunted.