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Adjective: lidless  lid-lus
  1. Having no lid
    "a lidless container"
  2. Always watchful
    "to an eye like mine, a lidless watcher of the public weal";
    - sleepless
  3. Not having or covered with a lid or lids
    "a lidless container"

See also: alert, topless, watchful

Antonym: lidded