undependable, unreliable

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big blue, blu-82, blue-chip stock, blue chip, carbon-14 dating, carbon dating, consistent, dependability, dependableness, radiocarbon dating, reliability, reliableness, right-hand, shopping, straight, tested, time-tested, tried, tried and true, trouper, true, undependability, undependableness, unreliability, unreliableness

authentic, certain, faithful, honest, sure, trusty, undeviating