Both Uses of

grotesque
in
Oliver Twist

Her body was bent by age; her limbs trembled with palsy; her face, distorted into a mumbling leer, resembled more the grotesque shaping of some wild pencil, than the work of Nature's hand.†
Chpt 24 *

Bolter's humble servant,' said Fagin, bowing with grotesque politeness.†
Chpt 42

Definitions:

(1) (grotesque)
distorted and unnatural in shape or size -- especially in a disturbing way

or:

ugly, gross, or very wrong
(2) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

More rarely, grotesque can refer to a style of art or instances of it that combines or distorts in a fanciful way natural forms into something that is often ugly or disturbing. Grotesque can also be used specifically to reference a gargoyle-like sculpture without a waterspout.