From The Collaborative International Dictionary of English v.0.48 :
Thickly \Thick"ly\, adv. In a thick manner; deeply; closely. [1913 Webster]From WordNet (r) 3.0 (2006) :
thickly adv 1: spoken with poor articulation as if with a thick tongue; "after a few drinks he was beginning to speak thickly" 2: in a concentrated manner; "old houses are often so densely packed that perhaps three or four have to be demolished for every new one built"; "a thickly populated area" [syn: densely, thickly] [ant: thinly] 3: with a thick consistency; "the blood was flowing thick" [syn: thickly, thick] [ant: thin, thinly] 4: with thickness; in a thick manner; "spread 1/4 lb softened margarine or cooking fat fairly thickly all over the surface"; "we were visiting a small, thickly walled and lovely town with straggling outskirt" [ant: lightly, thinly] 5: in quick succession; "misfortunes come fast and thick" [syn: thick, thickly]