undisguised

1885, Edward Dutton Cook, Anderson, John Henry, article in Dictionary of National Biography, 1885-1900, Volume 1: Abbadie - Anne, The bal masqué was ‘a scene of undisguised indecency, drunkenness, and vice.’

1890s, Xenophon, Henry Graham Dakyns (translator), Hellenica, Book 4, Chapter 5, So when they perceived the approach of Agesilaus, the Argives and their friends left the offerings as they lay, including the preparations for the breakfast, and retired with undisguised alarm into the city by the Cenchrean road.