* Formal: The meeting was ostensibly about budget cuts, but many suspected it was a veiled attempt to undermine the CEO.
* Informal: She ostensibly went to the library to study, but I suspect she was actually meeting her boyfriend.
* Literary: The castle stood on a hill, ostensibly a monument to the king's power, but in reality, a prison for his enemies.
Explanation:
"Ostensibly" means "apparently" or "seemingly". It's often used when something is presented as being one thing, but there's a hidden or implied truth behind it.
Note: "Ostensibly" suggests a degree of doubt or suspicion about the stated reason. It implies that the real reason may be different from what is being presented.