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Definition of undependable : Not to be trusted.

Synonyms:

strong, trick, trust, treacherous, fallible, unsound, temperamental

malleable, fluctuating, pliant, mutable, pliable, permutable, inconstant, plastic, modifiable, flighty, unreliable

questionable, dubious, untrustworthy

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

Usage examples:

• 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.