Intrepid: fearless; The hero of the book was intrepid from anything.

Desolate: deserted; Most planets in the galaxy are desolate.

Caustic: capable of burning; Did you read the warning label? It says “CAREFUL! CAUSTIC

Corrosive: harmful, destructive; Earthquakes can be very corrosive.

Noxious: injurious to health or physical well-being; Be careful, she may be noxious climbing that tree.