Pervading
Penetrated, spread through
Soliloquy
Homily, oration
Heretic
Agnostic, pegan
Vindictive
Implacable, grudge-bearing
Indelible
Persisting, lasting, something that is not easy to remove
Prelusive
Serving as introduction
Inferential
Reasoned, derivable
Usurper
Who comes into power illegally
Infelicity
Blunder, misfortune