Synonyms and related words :
adulterated, airy, attenuate, attenuated, cut, dilute, diluted, ethereal, fine, flimsy, gaseous, insubstantial, rare, rarefied, reduced, slight, subtile, subtle, tenuous, thin, thinned-out, uncompact, uncompressed, unsubstantial, vaporous, watered, watered-down, windy