The term 'nasty-smelling' can be described by three words: FETID, ACRID, and RANCID. FETID is an adjective that means having an extremely unpleasant smell, often associated with decay. ACRID is an adjective that means having a strong, pungent smell or taste that is often irritating to the nose or throat. RANCID is an adjective that means having a strong, unpleasant smell or taste caused by the process of decomposition. All three words describe a smell that is unpleasant and often associated with rot or decay.