noisome
NOY-sumadjMeaning having a very bad smell; also, harmful
Memory hook NOSE-SOME: hold your NOSE. The tuna sandwich forgotten in Dev’s gym bag for a week smells so bad that the whole team holds its nose; the bag is noisome.
A noisome odor drifted from the lunch box forgotten at the back of the closet.
In context Despite what its name suggests, the swamp was not noisy at all; it was noisome, giving off a stench of rotting plants that made visitors hold their noses.
Similar smelly, foul, stinking, offensive
Opposite fragrant, sweet-smelling, pleasant
From Middle English noy (annoyance) + -some. It has nothing to do with noise.