Longman Dictionary of Contemporary English - thinly

~ adv 1 in a way that has a very small distance between two sides or two flat surfaces  (thinly sliced bread) 2 scattered or spread over a large area, with a lot of space in between  (Sow the radish seeds thinly. | thinly populated/settled etc)  (The mountain regions are more thinly populated than the lowlands.) 3 thinly disguised/concealed etc if something or someone is thinly disguised etc, you can easily see what it really is  (moralism thinly disguised as fiction)