Synonyms and related words :
abatement, attenuation, attrition, blunting, damping, deadening, debilitation, devitalization, dilution, disembowelment, dulling, effemination, enervation, enfeeblement, exhaustion, extenuation, fatigue, gutting, inanition, languishment, mitigation, reduction, relaxation, slackening, softening, thinning, weakening