valuable
     adj 1: having great material or monetary value especially for use
            or exchange; "another human being equally valuable in
            the sight of God"; "a valuable diamond" [ant: {worthless}]
     2: having worth or merit or value; "a valuable friend"; "a good
        and worthful man" [syn: {worthful}]
     3: of great importance or use or service; "useful information";
        "valuable advice" [syn: {useful}, {of value}]
     n : something of value; "all our valuables were stolen"
Source: WordNet® 2.0