Godan verb with 'mu' ending, Intransitive verb
to be convinced (that); to be under the impression (that); to feel sure (that); to assume (that)
彼が僕にそう思い込ませたのです。He put the idea into my head. to make up one's mind; to set one's heart on; to be determined (to do); to be bent on
to be obsessed (with a thought, idea, etc.); to think about obsessively
Also written 思いこむ【おもいこむ】