Something is unchained when it's free from restraints that confine it. Better not leave your unchained bike outside of the library — someone might steal it!

Most people think it's fine to leave your dog unchained in the back yard for a while but consider it cruel when a dog is chained outdoors all day. To be chained is to be secured by a chain, and when you add the prefix un-, "not," you get the opposite. An unchained tiger cub can happily run back to its mother, and an unchained gate can freely swing open.

Definitions of unchained
  1. adjective
    not bound by shackles and chains
    synonyms: unfettered, unshackled, untied
    not restrained or tied down by bonds
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