Comfortable

1. Providing physical comfort and ease; agreeable. [from 18thc.]
2. In a state of comfort and content. [from 18thc.]
3. (obsolete) Comforting, providing comfort; consolatory. [14th-19thc.]
4. Amply sufficient, satisfactory. [from 17thc.]
5. (obsolete) Strong; vigorous; valiant.
6. (obsolete) Serviceable; helpful.

(providing/enjoying comfort): comforting, comfy, cozy, eathful, restful, snug, cushy

(safely reliable): safe

comfortless, uncomfortable