Merriam-Webster's Collegiate® Dictionary, 11th Edition
SLIM
I. adjective (slimmer; slimmest)
Etymology: Dutch, bad, inferior, from Middle Dutch slimp crooked, bad; akin to Middle High German slimp awry
Date: 1657
of small diameter or thickness in proportion to the height or length ; slender ,
2. mean , worthless , adroit , crafty ,
3. inferior in quality or amount ; slight , scanty , small , see: thin slimly adverb slimness noun
II. verb (slimmed; slimming)
Date: 1862
transitive verb to make slender ; decrease the size of, intransitive verb to become slender