1) Characterized by ludicrous or repulsive distortion; ugly or outlandish in appearance.
Francesco Melzi. Five grotesque heads. Pen and sepia ink on paper. Ca. 1515. Gallerie dell’Accademia, Venice.
2) A decorative painting style invented in ancient Rome–and rediscovered in Renaissance Europe–in which foliage and imaginary human and animal figures are combined in fanciful, extravagant designs.
Left: Grotesque ceiling decoration in fresco. Nero’s Golden House, Rome. 64-68 CE. Right: Nicoletto da Modena. Design for a panel of grotesque ornament. Engraving on paper. Second quarter of the 16th c. Victoria and Albert Museum, London.