infra dig

Shortened form of Latin infrā dignitātem (“beneath [one's] dignity”).

infra dig

1. (colloquial) beneath one's dignity
   • 1921 [1919], H. L. Mencken, The American Language, 2nd edition, New York: Alfred A. Knopf, →ISBN, →OCLC, Preface to the Second Edition:

     It would be regarded as infra dig., I am told, for an American professor of English to concern himself too actively with the English spoken by nearly a hundred millions of his countrymen.

• de minimis