1. foul-smelling; stinking
1. A noisome stench continuously drifts into our windows from the nearby canal.
2. offensive; unpleasant
2. After ten years of living in that city, I had come to find everything about it so noisome that I felt I simply had to get out of there.
Try to extract out two words from it. NOSENOISE. Hence NOISOME is something that makes NOISE in our NOSE