Wistful

[wist-fuhl] (adjective)

Having or showing a feeling of vague or thoughtful longing, often with a touch of sadness, for something that is absent or unattainable.

SYNONYMS

nostalgic yearning pensive longing forlorn

ANTONYMS

content satisfied indifferent
As she looked at old photographs, a wistful smile crossed her face, remembering the carefree days of her youth.