Mellifluous: (adj.) a sound that is pleasing to hear. Somnambulist (n.): a sleepwalker. Sonorous: (adj.) an imposingly deep sound. Limerence: (n.) the state of being infatuated with another person. Bombinate: (v.) to hum or buzz. Ethereal: (adj.) not of this world. Iridescent: (adj.) producing rainbow-like colors. Effervescence: (n.) bubbles in a liquid.