The word "憨厚" is formed by combining the individual characters "憨" and "厚", where "憨" denotes a sense of simple, straightforward, or even foolish sincerity, and "厚" conveys thickness or depth, figuratively representing earnestness and kindness. Together, these characters semantically merge to describe a personality trait of genuine, unpretentious honesty, with each component contributing directly to this combined meaning.