sincere; ingenuous; guileless

(idiomatic) Having the joy and vitality associated with younger people, despite one's own advanced age.

(archaic) timorous; timid; easily frightened.

timid; easily frightened; chicken-hearted

(idiomatic) Kind and well-intentioned.

Having a faithful heart; honest; sincere; not faithless or deceitful.

sincerely / passionately

(medicine) Athletic heart syndrome.

Wholehearted. / Full of courage or confidence. / Elated. / Full of emotion; too much moved for full self-control.

A surgeon of the heart.