adj.单纯的,自然的,不做作的,拙劣的
He smiled as artless as a child of 5.
他笑得像个5岁的孩子那样天真烂漫.
She was curiously artless.
她单纯得令人难以置信。
the artless sincerity of a young child
幼童的天真烂漫