From The Collaborative International Dictionary of English v.0.48:

Useful \Use"ful\, a.
   Full of use, advantage, or profit; producing, or having power
   to produce, good; serviceable for any end or object; helpful
   toward advancing any purpose; beneficial; profitable;
   advantageous; as, vessels and instruments useful in a family;
   books useful for improvement; useful knowledge; useful arts.
   [1913 Webster]

         To what can I useful!                    --Milton.
   [1913 Webster]
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