i-adjective
honest-looking; sincere-seeming
Describes a person or their appearance, words, or manner as giving an impression of honesty and sincerity. Often used when the outward impression may or may not match the inner reality.
彼の実らしい笑顔に、みんな心を許した。
Everyone let their guard down at his sincere-looking smile.
あの人の話し方はとても実らしい。
That person's way of speaking seems very honest.