n. a person, thing, or event that causes a reaction or other event to occur

adj. honest or sincere; serious

n. that which is exchanged for something else

adj. experiencing or displaying extreme joy or bliss

n. an imagined state or place in which everything is unpleasant or bad, typically a totalitarian or environmentally degraded one

n. a natural inclination

n. an imagined place or state of things in which everything is perfect

adj. having a feeling of thoughtful sadness

adj. working or spreading in a hidden and, usually, harmful way