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Rancid
rancid
Rancidity
The rafflesia plant makes a unpleasant smell
I would use the term rancid.
Yes and it's a very unpleasant smell.
durian.....
Effluvial
A strong unpleasant smell
No. It has a very unpleasant odor.
Stench.
A peculiar, peircing or unpleasant smell.