Unbreakable is from un- ('not') + breakable. Break descends from Old English brecan ('to break, shatter'), from Proto-Germanic *brekan, from Proto-Indo-European *bhreg- ('to break'). Important recorded forms include un- (Old English), brecan (Old English), and *bhreg- (Proto-Indo-European). Morphologically, the un- element marks negation, reversal, removal, or deprivation, while the base supplies the action, quality, or state being denied or undone. The modern sense continues the older lexical line without requiring a separate origin. In current use it covers impossible to break or destroy. The wider family includes derived forms such as unbreakably and unbreakableness and related words such as break, breakable, and unbroken.