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back-of-the-envelope adjective

  /-ɛnvəˌlop/ , /-ˈɑnvəˌloʊp/ , /-ˈɒnvləʊp/ , /-ˈɒnvələʊp/ , /ˌbæk‿əv ði ˈɛnvəˌloʊp/ , /ˌbæk‿əv ðiː ˈɛnvələʊp/
  • (idiomatic, informal) Especially of a calculation, estimation, or other reasoning, or an idea: approximate, rough, simplified. [from 20th c.]
 sottobicchiere
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