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Comprehensive
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Achilles heel any vulnerable or weak spot, part, or trait.
airtight having no weak points open to attack. [1/2 definitions]
anticlimax a disappointingly weak or ordinary conclusion or event, following events or statements that build expectations for something powerful or moving. [1/3 definitions]
broken-down weak or shattered from disease or age.
carbonic acid a weak colorless unstable acid, present only in solution, formed by dissolving carbon dioxide in water.
daffy (informal) silly, foolish, crazy, or weak-minded in mood or temperament.
delicacy weak constitution; frail health. [1/8 definitions]
delicate of a weak or sickly nature. [1/7 definitions]
devil's advocate someone who may not believe in but defends an opposing, weak, or unpopular cause to stimulate argument. [1/2 definitions]
doting weak-minded from old age; senile. [1/2 definitions]
dotty1 (informal) eccentric, weak-minded, or a little crazy; daft. [1/4 definitions]
faint weak, feeble, or slight. [1/5 definitions]
fall apart to become weak or damaged in various ways; fall into disrepair. [1/4 definitions]
feckless weak or incompetent; ineffective. [1/2 definitions]
flimsy not solid or substantial; fragile; weak. [1/3 definitions]
force of nature in physics, any one of the fundamental forces that occur in nature, including electromagnetic force, weak nuclear force, strong nuclear force, and gravitational force. [1/3 definitions]
four-flusher (informal) one without the means to deliver on a promise; one whose position is weak, but who nonetheless presents it as strong; bluffer.
frail1 weak or sickly. [1/4 definitions]
globulin in many plant and animal tissues, any of a number of simple proteins that will dissolve in a weak solution of salt and water, though not in water alone, and will coagulate when heat is applied.
hypochlorous acid a weak acid found only in solution or in its salt form, used for oxidizing, bleaching, and disinfecting.
infirm weak or ill, as from old age. [1/2 definitions]