Synonyms and related words :
adynamia, anemia, atony, bloodlessness, cachexia, cachexy, cowardice, debilitation, debility, dullness, etiolation, faintness, fatigue, feebleness, flabbiness, flaccidity, impotence, languishment, languor, lassitude, listlessness, prostration, sluggishness, softness, strengthlessness, weakliness, weakness, weariness