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Adjective: rigorous  ri-gu-rus
  1. Rigidly accurate; allowing no deviation from a standard
    "rigorous application of the law";
    - strict
     
  2. Demanding strict attention to rules and procedures
    "rigorous discipline";
    - stringent, tight
     
  3. Painstakingly careful and accurate
    "our accountant is rigorous";
    - thorough
     
  4. Performed comprehensively and completely; not superficial or partial
    "a rigorous study";
    - exhaustive, thorough, thoroughgoing, in-depth
     
  5. Without qualification; used informally as an (often pejorative) intensifier
    - arrant, complete, consummate, double-dyed, everlasting, gross, perfect, pure, sodding, stark, staring, thorough, thoroughgoing, utter, unadulterated

See also: careful, complete, demanding, exact, exacting, unmitigated

Encyclopedia: Rigorous