彼の天真な性格は、時に無防備すぎるように見える。
His naive personality sometimes seems overly defenseless.
innocent; naive; artless; unaffected; genuine; childlike
natural expression of one's true self; unaffected sincerity
Composed of 天 (heaven, nature) and 真 (truth, reality), suggesting an innate, heaven-sent purity. The exact historical derivation is uncertain, but the compound is conventionally associated with natural, unadorned innocence.