Withnailesque adjective1 •(rare) Reminiscent of Withnail and I (1987), a British black comedy film about two young, unemployed, binge-drinking actors living in a squalid flat in 1960s London.And seventy years later the last of Pentonville Road's original arch-windowed townhouses, two-million-quid jobs anywhere else, now wallowed in Withnailesque decay […] — 2003 formsmore Withnailesque · most Withnailesque