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languished: become weak
after being stranded on an island for hours, the hikers languished, eating protein bars alone.

attenuate: taper off.
Her anger attenuated so far that she was civil to her again.

fickle: changing unpredictable
Florida weather is fickle.

inimitable: without equal
J K rowling was hailed as an inimitable writer.

artlessness: innocence
Her speech voted to be charming. basically due to her artlessness.