fickle (part of speech: adjective)
unreliable (part of speech: adjective)
irresolute (part of speech: adjective)
shrinking, tentative, ambivalent, uncertain, shifty, watery, inconsistent, hesitant, dillydallying, infirm, shy, indecisive, irresolute, irresponsible, vacillating, unsure, insipid, flitting, yellow, weak, impulsive, capricious, volatile, changeable, erratic, double-minded, unwilling, shilly-shally, unresolved, halfhearted, fly-by-night, spineless, fickle, undecided
- Dr. Blackford reports on No. 3: He is easily influenced; too undependable and too lax in discipline to make a good executive. - "Analyzing Character", Katherine M. H. Blackford and Arthur Newcomb.
- Those descriptions of the discarnate state, moreover, which reach us through mediums are undependable. - "Modern Religious Cults and Movements", Gaius Glenn Atkins.
- Women are always undependable. - "The Great Drought", Sterner St. Paul Meek.