彼は自己の主義に忠実でいる。の英語

He remains loyal to his principles.

He remained steadfast to his principles.

He persists in his opinion.

He is faithful to his principles.

He persists in his opinion.

He sticks to his own opinion.

He remained steadfast to his principles.

He adhered to his own theory.

He stuck with his own theory.

He faithfully discharged his duty.

He persisted in his opinion.

He is the personification of selfishness.

He is adhesive to the cause.

He still sticks to his opinion.

He is wedded to his opinion.

He is not good at expressing himself.

He is timid.

He held to his opinion.

He persisted in his opinion.

he staunchly defended his principles

He calls himself simple and honest―gives himself the character of honest simplicity.

He calls himself simple and honest

He gives himself the character of honest simplicity.

He is a thorough-going egoist.

He is wedded to his opinion.

He is true to his trust.

He is wedded to his opinion

He holds fast to his views.

He strongly insisted on his own principles.

He lacks self-direction.