Literary or formal term for shyness; not used in casual conversation. Modern Japanese more commonly uses 恥ずかしがり屋 or 内気.
His shyness shows especially strongly with people he meets for the first time.
Overcome by a feeling of bashfulness, she looked down.
Sino-Japanese compound from 含 (contain, hold) and 羞 (shame, shyness). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning of shyness.