being of delicate or slender build; "she was slender as a willow shoot is slender"- Frank Norris; "a slim girl with straight blonde hair"; "watched her slight figure cross the street"
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faint
lacking strength or vigor; "damning with faint praise"; "faint resistance"; "feeble efforts"; "a feeble voice"
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bony
very thin especially from disease or hunger or cold; "emaciated bony hands"; "a nightmare population of gaunt men and skeletal boys"; "eyes were haggard and cavernous"; "small pinched faces"; kept life in his wasted frame only by grim concentration"
