Anything slim is thin or narrow. So, your sister may be considered slim, and you could also have "a slim chance" of winning the lottery.

Slim people are slender, and slim things are usually delicate, like a slim watch band. You can also use slim to describe a margin or a chance: "There was only a slim likelihood that the home team would win this game." Back in the early 1800s, to slim meant "to do one's work carelessly," and in the seventeenth century, the adjective was also used to mean "sly or crafty."

Definitions of slim

adj being of delicate or slender build

“a slim girl with straight blonde hair”
slender, slight, svelte
lean, thin
lacking excess flesh

adj small in quantity

“a slim chance of winning”
little, small
limited or below average in number or quantity or magnitude or extent

v take off weight

lose weight, melt off, reduce, slenderize, slim down, thin
gain, put on
increase (one's body weight)
sweat off
lose weight by sweating
Type of:
change state, turn
undergo a transformation or a change of position or action

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