think (to have an opinion or idea): What do you think of my boss? I think it’s going to rain tonight.
believe (to have an opinion or idea): She strongly believes that it is possible.
feel (to have an opinion, especially one based on your feelings rather than on facts): I feel that she may not like me.
reckon informal (to believe or suppose): We’ll have to do it again, I reckon.
be under the impression (to believe something, usually mistakenly): I’m sorry, I was under the impression that you weren’t coming.