Thinking that something is true, especially something bad, without having definite proof.
Suspecting usually means feeling worried or unsure about something.
Examples:
I am suspecting that he took my toy.
She is suspecting that the cat ate her food.
They are suspecting that the dog ran away.
We are suspecting that the teacher is a robot.
He is suspecting that aliens are living in his closet.
You suspecting that I ate all the cookies!