stumbler

Noun stumbler has 2 senses

• stumbler(n = noun.person) tripper - a walker or runner who trips and almost falls;
is a kind of footer, pedestrian, walker
Derived form verb stumble₂

• stumbler(n = noun.person) blunderer, botcher, bumbler, bungler, butcher, fuckup, fumbler, sad sack - someone who makes mistakes because of incompetence;
is a kind of incompetent, incompetent person
Derived form verb stumble₄