Source : Webster's Revised Unabridged Dictionary (1913)

Unbroken \Un*bro"ken\, a.
   Not broken; continuous; unsubdued; as, an unbroken colt.

Source : WordNet®

unbroken
     adj 1: marked by continuous or uninterrupted extension in space or
            time or sequence; "cars in an unbroken procession";
            "the unbroken quiet of the afternoon" [ant: {broken}]
     2: not subdued or trained for service or use; "unbroken colts"
     3: (of farmland) not plowed; "unplowed fields"; "unbroken land"
        [syn: {unplowed}, {unploughed}] [ant: {plowed}]
     4: (especially of promises or contracts) not violated or
        disregarded; "unbroken promises"; "promises kept" [syn: {kept}]
        [ant: {broken}]
     5: not broken; whole and intact; in one piece; "fortunately the
        other lens is unbroken" [ant: {broken}]