th 10 Grade ACT Vocabulary Unit #18 retainer N. a person or thing that keeps possession of retribution N. a reward or punishment, especially for evil rift N. an opening made by splitting rivulet N. a small stream ruminate V. to chew again or over and over sadistic Adj. deriving pleasure from extreme cruelty sagacious Adj. having or showing acute mental or keen practical sense satiate V. to supply with anything to excess scenario N. an outline of the plot of a dramatic work, giving particulars to a scene scintillate V. to sparkle; flash scruple N. a moral or ethical consideration or standard that acts as a restraining force or inhibits certain actions sedulous Adj. persistently or carefully maintained senile Adj. showing a decline of physical or mental functioning as a result of old age simulate V. to create a likeness or model of skeptical Adj. having doubt WORD POWER -culp- fault -fid belief; faith confident all omniscient -psyc culpable fidelity -omni culprit mind, sprit Psychologist mono omnivore monorail psychic one monologue