ostensibly
[adverb]
Synonyms: apparently, on the face of it, professedly, seemingly, supposedly

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Contrasted words: genuinely, really, truly, au fond, basically
Related Idioms: on the face of it, on the surface, to the eye
Related Words: externally, superficially, sensibly

[TahlilGaran] English Synonym Dictionary ▲

os‧ten‧si‧bly /ɒˈstensəbli, ɒˈstensɪbli $ ɑː-/ adverb
if something is ostensibly true, people say that it is true but it is not really true Synonym : supposedly:
She stayed behind at the office, ostensibly to work.

[TahlilGaran] Dictionary of Contemporary English ▲