self explanatory

/ˌsɛlfɪkˈsplænəˌtɔri/
adjective
  1. Easily understood without needing explanation; obvious from its appearance or context.
    • The instructions for the game are self-explanatory, so you don't need a manual.
    • Her reaction was self-explanatory: she smiled and hugged him.
    • The diagram is self-explanatory and shows exactly how to assemble the furniture.
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