supposititious

 
Pronunciation: /səˌpɒzɪˈtɪʃəs/

adjective

  • substituted for the real thing; not genuine: the supposititious heir to the throne

Derivatives

supposititiously

adverb

supposititiousness

noun

Origin:

early 17th century: from Latin supposititius (from supponere 'to substitute') + -ous