ostensibly
adverb
[ ɒˈstɛnsɪbli ]
• as appears or is stated to be true, though not necessarily so; apparently.
• "the party secretary resigned, ostensibly from ill health"
Similar:
apparently,
seemingly,
on the face of it,
to all appearances,
on the surface,
to all intents and purposes,
outwardly,
superficially,
allegedly,
professedly,
supposedly,
purportedly,
pretendedly,
ostensively,