An unpleasant, foul, or offensive odor is formally referred to as a bad odor, malodor, stench, reek, or stink. In scientific and medical contexts, a foul odor resulting from bacterial decomposition or bodily secretions is classified as malodor or halitosis (when originating from the mouth). In everyday conversation, people use vivid nouns like stench or reek to describe overwhelming unpleasant smells coming from garbage, industrial chemicals, or spoiled food, instantly conveying a strong negative sensory reaction to listeners.
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