to cause (feelings, sound etc) to lose strength, brightness

diminish, muffle, quiet

making (a person, her or his health) weak

incapacitate

to cause (a person) to be very sad

deject, make despondent; exhaust

dried out

take moisture out of

to cause (a person) to lose physical or moral strength

tire, wear out

enervate, the continuous state of it

tire, wear out

(to cause a person, liquid, determination etc) to be or become weak(er)

reduce the strength of