1. [adj]  producing little or no profit or gain; "deposits abandoned by mining companies as unprofitable"
2. [adj]  without profit or reward; "let us have no part in profitless quarrels"- D.D.Eisenhower; "How weary, flat, stale, and unprofitable / Seem to me all the uses of this world"- Shakespeare
3. [adj]  not worth using

UNPROFITABLE is a 12 letter word that starts with U.