sfumato (en)

(noun) the definition of form in painting without abrupt outline by the blending of one tone into another

stygian (en)

(adjective) extremely dark, gloomy, or forbidding; refers to the River Styx of the underworld Hades in Greek mythology;

telluric (en)

(adjective) of or relating to the earth; terrestrial / (adjective) being or relating to a usually natural electric current flowing near the earth's surface

veridical (en)

(adjective) truthful veracious / (adjective) not illusory; genuine