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adjective
tepid - Lacking in heat, strength, or enthusiasm.
verb
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Droop - To hang or bend downward limply.
scrawny - (of a person or animal) unattractively thin and bony
succumb - Fail to resist (pressure, temptation, or some other negative force)
Moribund - In a dying or near-death state — no longer active or effective — stagnant or declining.
Capitulate - To give in or stop resisting something, often unwillingly.
crumble - Break or fall apart into small fragments, especially over a period of time as part of a process of deterioration
flimsy - Comparatively light and insubstantial; easily damaged
decrepit - (of a person) elderly and infirm
frail - (of a person) weak and delicate
noun
undoing - The process through which something falls apart or is ruined
subservient - Willing to obey others unquestioningly; submissive.