fail-safe, infallible, reliable, secure, certain, dependable, sure, trustworthy, unerring, guaranteed, surefire, fool-safe, error-proof, idiot-proof, safe
Unreliability - inconsistency - unpredictability - instability - untrustworthiness - fickleness - capriciousness - variability - changeableness - inconstancy - unreliableness - undependableness - unsteadiness - erraticism - irregularity - flightiness - volatility - shakiness - wavering - vacillation - fluctuation - impermanence - mutability - slipperiness - faithlessness - infidelity - disloyalty - unfaithfulness - treachery - unreliability
Undependability refers to the characteristic or state of being unreliable or untrustworthy. It indicates a lack of consistency, predictability, or reliability in a person's actions or in the functionality of an object or system. An undependable person or entity may often fail to meet commitments or expectations, resulting in unpredictability and potential disappointment.