spoken with poor articulation as if with a thick tongue;
"after a few drinks he was beginning to speak thickly"
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" Synonym(s):densely, thickly Antonym(s):thinly
with a thick consistency; "the blood was flowing thick" Synonym(s):thickly, thick Antonym(s):thin, thinly
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" Antonym(s):lightly, thinly
in quick succession; "misfortunes come fast and thick" Synonym(s):thick, thickly
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Thickly \Thick"ly\, adv.
In a thick manner; deeply; closely.