#695
Generally appearances are deceptive, i.e. things are not always what they
seem to be. If one says that a Water Tank is deceptively small, it means
it actually holds a quite a lot of water as compared to the expression. Whilst
delusion, in other words also means that sometimes it will be misleading or
sometimes it will be a false belief in one's own importance, especially, may
be a symptom of madness i.e. suffer from delusion. People interpret it in
a different way.
Balasubramanian
Ambattur