seeming or stated to be real or true, when this is perhaps not the case (Oxford)
appearing or claiming to be one thing when it is really something else (Cambridge)
The ostensible reason for his absence was illness. (Oxford)
Their ostensible goal was to clean up government corruption, but their real aim was to unseat the government. (Cambridge)
ostensible reason
ostensible goal
Demonstrative
Exhibited
Unlikely
Ostensibly