General Antonyms:
* Unresourceful
* Helpless
* Inept
* Unskilled
* Incompetent
* Clueless
More Specific Antonyms:
* Dependent (if resourceful implies independence)
* Uninventive (if resourceful implies creativity)
* Impractical (if resourceful implies practicality)
* Unprepared (if resourceful implies preparedness)
* Wasteful (if resourceful implies efficient use of resources)
The best antonym for "resourceful" will depend on the specific context in which the word is used.