Source : Webster's Revised Unabridged Dictionary (1913)

Thinly \Thin"ly\, a.
   In a thin manner; in a loose, scattered manner; scantily; not
   thickly; as, ground thinly planted with trees; a country
   thinly inhabited.

Source : WordNet®

thinly
     adv 1: without force or sincere effort; "smiled thinly"
     2: without viscosity; "the blood was flowing thin" [syn: {thin}]
        [ant: {thickly}]
     3: in a small quantity or extent; "spread the margarine thinly
        over the meat"; "apply paint lightly" [syn: {lightly}]
        [ant: {thickly}]
     4: in a widely distributed manner; "thinly overgrown
        mountainside" [ant: {densely}]