nonexplanatory

/ˌnɑnɪkˈsplænəˌtɔri/
adjective
  1. Not providing an explanation; failing to make something clear or understandable.
    • The manual was almost nonexplanatory, with no diagrams or step-by-step instructions.
    • His email was frustratingly nonexplanatory, just saying 'see me later' without any reason.
    • The teacher's nonexplanatory answer left the students even more confused.
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