peaceful; (of a body of water) free from disturbance by heavy waves
The tranquil lake reflected the mountains perfectly on the mirror surface.
Vocabulary like tranquil appears on the Digital SAT in Words-in-Context questions, where you choose the word that fits a passage's meaning and tone. You can also drill this word with vocabulary flashcards.
lethargy; a state of motor and mental inactivity with a partial suspension of sensibility
convoluted; highly complex or intricate and occasionally devious
exercising absolute political control
sway; move without being stable, as if threatening to fall
poisonous or extremely harmful
cooperative; easily managed (controlled or taught or molded)
custom; an inherited pattern of thought or action
slander; speak unfavorably about