This document defines 12 vocabulary words: sullenly, imminent, iridescent, serene, infallibility, blighted, doggedness, reiterated, precariously, evanesced, spite, and heresy. For each word, it provides the definition and an example sentence using the word. The vocabulary words cover a range of meanings including moods, likelihood of events, colors, calmness, abilities, diseases, persistence, repetition, security, fading away, annoyance, and unorthodox beliefs.