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Rancid.
The oils in nuts will make any of them go bad or rancid at some point. They are not bad in the sense they will make you sick just taste bad.
To go rancid something must contain fats or oils.
As tea itself does not, it cannot go rancid.
However tea that you have added milk or cream to can, when the milk fats in the milk or cream go rancid.
Slightly rancid.
Yes it is very bad i would not reccomend it.