1 the quality of having a small distance between two opposite sides: --
2 the quality of having only a small number of people or a small amount of something: --
3 the quality of being of a poor standard or not good enough to be effective: --
the thinness of the singer's voice
4 the quality of flowing easily or containing a lot of water: --
5 (of air) the quality of containing less oxygen than usual: --
The thinness of the air can make you feel breathless.
The lack of friction due to the thinness of the air will mean he can attain a much higher terminal velocity.
Because of the paint's thinness, it ran everywhere.
I was disappointed by the thinness of the sauce.
How did he convince himself that, despite the thinness of his résumé, he could somehow get the top job?
The thinness of much of his work results from his inexperience.
On the ballads, it was hard to disguise the thinness of the voice.
The play's crucial fault is the thinness of those characters, who mostly come off as sentimental clichés.
He also said the dossier should have made clear the thinness of the evidence on which the claim was based.