Godan verb with 'u' ending, Transitive verb
to think; to consider; to believe; to reckon
想う has connotations of heart-felt
晴れだと思うよ。I think it will be sunny. to think (of doing); to plan (to do)
to judge; to assess; to regard
to imagine; to suppose; to dream
to expect; to look forward to
to feel; to be (in a state of mind); to desire; to want
to care (deeply) for; to yearn for; to worry about; to love
to recall; to remember
Also written 想う【おもう】、憶う【おもう】、念う【おもう】