mercurial- a drug containing mercury 

petrichor- a smell that accompanies the very first rain after a long period of dry weather

melancholia- severe depression characterized especially by sadness and despair. 

emancipation- freeing of someone from slavery 

pulchritude- beauty 

afterglow- a glow 

prevarication- act of lying 

sobriquet- nickname 

euphoric- feeling of intense excitement and happiness 

tranquil- free from disturbance; calm. 

opacarophile- a person who loves sunsets