From Longman Dictionary of Contemporary Englishunmentionablesun‧men‧tion‧a‧bles /ʌnˈmenʃənəbəlz/ noun [plural] old-fashionedDC underwear – used humorously
Examples from the Corpus
unmentionables• A litany of nits, ringworm, fleas and unmentionables ... But as the weeks and months passed, everything changed. 