1 : very steep; having a prominent and almost vertical front; "a bluff headland"; "where the bold chalk cliffs of England rise"; "a sheer descent of rock"
2 : harshly ironic or sinister; "black humor"; "a grim joke"; "grim laughter"; "fun ranging from slapstick clowning ... to savage mordant wit"
adjectif
1 : having or made by a thin edge or sharp point; suitable for cutting or piercing
2 : having the ability to perceive or understand; keen in discernment
3 : having a strong physiological or chemical effect
