thick is a common English word with multiple meanings:
1. Having a large distance between opposite sides; not thin
2. Measuring a specified distance from side to side
3. Made up of a large number of things or people close together
4. (of a liquid) Relatively firm in consistency; not flowing freely
5. (informal) Stupid or slow to understand
6. (of a voice) Not clear or distinct
7. (of an accent) Very noticeable and strong