Meaning : Spoken with poor articulation as if with a thick tongue.
Example :
After a few drinks he was beginning to speak thickly.
Meaning : With thickness. In a thick manner.
Example :
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.
Thickly meaning in Bengali (Bangla).