Esoteric, 8 letters
Like some air, 8 letters
Lofty, 8 letters
More subtle, 8 letters
Thin, 8 letters
Becomes thin, 8 letters
Distills, 8 letters
Become thinned, 6 letters
Become thinner, as air, 6 letters
Lessen the density of, 6 letters
Make less dense, 6 letters
Make more refined, 6 letters
Make more subtle, 6 letters
Make thinner, like mountain air, 6 letters
Reduce the density of, 6 letters
Refine further, 6 letters
Thin beam broken by person in stripes (6), 6 letters
Thin out, 6 letters
A decrease in the density of something, 11 letters