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Adjective: restful  rest-ful
  1. Affording physical or mental rest
    "she spent a restful night at home";
    - reposeful, relaxing
Adjective: RESTful
  1. (computing) using REST (representational state transfer)
    "They designed a RESTful API for their web service"

See also: slumberous, slumbrous

Encyclopedia: Restful

RESTful