SKINNY is validvalid

very thin [adj SKINNIER, SKINNIEST] : SKINNINESS [n] / one who is skinny [n SKINNIES]

28,177 of 196,601 in NWL2023·also valid in CSW24

having little fat [adj SKINNIER, SKINNIEST] / information, as in 'give me the skinny' [n SKINNIES]