wistful (adj.) Look up wistful at Dictionary.com
1610s, "closely attentive," perhaps from obsolete wistly "intently" (c.1500), of uncertain origin. Perhaps formed on the model of wishful. Middle English wistful meant "bountiful, well-supplied," from Old English wist "provisions." The meaning of "longingly pensive, musing" is by 1714. Related: Wistfully; wistfulness.