Velleity

velleity \ve-ˈlē-ə-tē, və-\ noun: 1. the lowest degree of volition, 2. a slight wish or tendency; inclination

Etymology: New Latin velleitas, from Latin velle to wish, will

I was introduced to this word through a friend who used it to mean “a desire not strong enough to be acted upon.” No other word means exactly that, so I continue to use velleity in this sense.