衰 - decline, wane, weaken

to become weak; to decline; to wear; to abate; to decay; to wither; to waste away

decline; degeneration; decay; waning; ebbing

rise and fall; ups and downs; welfare; vicissitudes

weakness; debility; breakdown; prostration

senility; senile decay; infirmity (through age)

weakening; emaciation; decline

attenuation (factor, rate)

psychasthenia

decline; downfall; ruin(ation)

echo suppressor

attenuation coefficient

attenuation distortion