This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. The property of being slender.

n. Slender character, quality, or condition.

n. the quality of being slight or inadequate

n. relatively small dimension through an object as opposed to its length or width

n. the property of an attractively thin person

"I was still somewhat thin, but now it could be called slenderness, not thinness."

inadequacy    deficiency    insufficiency    dimension    spareness    leanness    thinness   

thinness   

meagerness    scantiness   

tenuity    slimness    roundness    fragility    thinness    fineness    slightness    hollowness    suppleness    toughness