GMAT Vocabulary Flash Cards @ englishpdf.com and englishteststore.com File 610 simultaneous (adj) Occurring, done, or existing at the same time sinecure (n) Any position having emoluments with few or no duties singe (v) To burn slightly or superficially sinister (adj) Evil sinuosity (n) The quality of curving in and out sinuous (adj) Curving in and out sinus (n) An opening or cavity siren (n) A sea-nymph, described by Homer as dwelling between the island of Circe and