slim (adj.) Look up slim at Dictionary.com
1650s, "thin, slight, slender," from Dutch slim "bad, sly, clever," from Middle Dutch slim "bad, crooked," from Proto-Germanic *slembaz "oblique, crooked" (cognates: Middle High German slimp "slanting, awry," German schlimm "bad, cunning, unwell"). In English 17c. also sometimes with a sense "sly, cunning, crafty." Related: Slimly; slimness. With obsolete extended adjectival forms Slimsy "flimsy, unsubstantial" (1845); slimikin "small and slender" (1745). Slim Jim attested from 1887 in sense of "very thin person;" from 1902 as a type of slender cigar; from 1975 as a brand of meat snack.
slim (v.) Look up slim at Dictionary.com
1808, "to scamp one's work, do carelessly or superficially," from slim (adj.). Meaning "to make slim" (a garment, etc.) is from 1862; meaning "reduce (one's) weight" is from 1930. Related: Slimmed; slimming.