assumed as true, regardless of fact; hypothetical: a supposed case.
accepted or believed as true, without positive knowledge: the supposed site of an ancient temple.
merely thought to be such; imagined: supposed gains.
Origin of supposed
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
(prenominal) presumed to be true without certain knowledgehis supposed date of birth
(prenominal) believed to be true on slight grounds; highly doubtfulthe supposed existence of ghosts
(səˈpəʊzd) (postpositive foll by to) expected or obliged (to)I'm supposed to be there at nine
(səˈpəʊzd) (postpositive; used in negative foll by to) expected or obliged not (to)you're not supposed to walk on the grass
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
"believed or thought to exist," 1580s, past participle adjective from suppose (q.v.); often with the -e- pronounced, to distinguish it from the passive past tense supposed, now common in the sense of "to have a duty or obligation" (1859).
Online Etymology Dictionary, © 2010 Douglas Harper