sturdiness Antonyms

fragile nature Achilles tendon weakness unwellness sickness malady insubstantiality infirmity illness frailty fragility unsoundness roller coaster heel of achilles chink in one's armor flood drain ebb and flood crests and troughs ebb and flow chink in the armor Achilles heel weak point gremlin foible flimsiness flaw delicacy deficiency defect decrepitude debility daintiness complaint caducity brittleness blemish delicateness disease feebleness fault fatigue fallibility failing exility exhaustion enfeeblement enervation distemperature ailment