subfusc /sʌbˈfʌsk/noun 3adjective 1forms 3 noun3 •Dark clothing. •Clothing acceptable, by regulation at certain universities, for an examination or official event. •Formal clothing worn on special academic occasions. adjective1 •Having subdued colors.And I notice that we are both decently sub-fusc. Have you seen Trimmer in that frightful frock like a canary lampshade? — 1935 formssubfuscs · more subfusc · most subfusc