Earthiest

adjective

1. Resembling dirt or soil (i.e. earth).

   "The earthy smell of fresh turned loam told me the farmer had started plowing this morning, the definitive sign of spring for me."

2. Down-to-earth, not artificial, natural.

   "She was an earthy soul, the salt of the earth as they say of such rural folk, untarnished by false civilization."

3. Coarse and unrefined, crude.

   "earthy humour"

4. Like or resembling the earth or of the earth.
5. Covered with earth (mud, dirt).