sə|päzə|tishəs adjective
Etymology: Latin suppositicius substituted, spurious, from suppositus (past participle of supponere to place under, substitute) + -icius, -itious; in senses 2 & 3 influenced in meaning by English supposition
1.
a.
(1) : fraudulently substituted for something else
(2) : not being what it purports to be : spurious , counterfeit
despatched a lawyer … to enlarge upon the theme of his father's supposititious affluence — John Kobler
b. of a child
(1) : presented as a genuine heir
(2) : illegitimate
2. : imaginary , fabulous
the supposititious toga in which popular imagination had garbed his impressive form — S.H.Adams
3. : of the nature of a supposition : hypothetical
whether the anticipation be mine or that of a supposititious observer — Victor Lowe
• sup·pos·i·ti·tious·ly adverb
• sup·pos·i·ti·tious·ness noun -es