しん信shinじるjiru
1.
To accept something as true with complete conviction, leaving no room for doubt or skepticism, often involving a deep personal or emotional commitment to that belief.
2.
To fully endorse and act upon one's own judgment regarding a situation, disregarding alternative viewpoints or possibilities.
3.
To embrace and affirm the statements or actions of someone, recognizing them as trustworthy and valid without reservation.
4.
To willingly submit oneself to the authority or teachings of a higher power, expressing devotion and a desire to follow spiritual guidance.
Example:
きっと彼はあなたを信じると思いますよ。