To make somebody believe something that is not true. (oxford)
to fool yourself into believing something is true because you want it to be true, when it is actually not true (Cambridge)
Don't be deluded into thinking that we are out of danger yet. (Oxford)
He’s deluding himself if he thinks he’s going to get that promotion . (Cambridge)
deluding himself
deluded into thinking
Cheat
Mislead
Deceive
Be Honest
Be Truthful
Deluding
Delusion