indefatigableadjective · Level 2 SAT1showing sustained enthusiastic action with unflagging vitalityThe indefatigable researcher spent forty years cataloguing every species in the Amazon basin.ModuleLevel 2Registercommon, contrastCollectionCollection 049SAT Plus planAlso in Collection 049carrion, cereal, coercion, competitive, intimation, absolute, ambulatory, altruistic and 1 more