YOU SAID:

"did not have full use of his mental faculties"

INTO JAPANESE

「彼の精神的能力を十分に活用していませんでした」

BACK INTO ENGLISH

"I didn't make full use of his mental abilities."

INTO JAPANESE

「私は彼の精神的能力を十分に活用していませんでした。」

BACK INTO ENGLISH

"I wasn't making full use of his mental abilities."

INTO JAPANESE

「私は彼の精神的能力をフルに活用していませんでした。」

BACK INTO ENGLISH

"I wasn't making full use of his mental abilities."