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Definition of Keyless
1. Adjective. Lacking or not requiring a key. "A keyless lock operated by a series of pushbuttons" 
Antonyms: Keyed
Definition of Keyless
1. being without a key [adj]
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1. Adjective. Lacking or not requiring a key. "A keyless lock operated by a series of pushbuttons" 
1. being without a key [adj]