but isn't grotesque from grotto?

have you ever been in a sea side grotto? they are slimy, dark, dangerous, scary!

even stylized grottos in gardens are somewhat grotesques --scary--they like 'house of horrors' ride at amusment parks are designed to make a young girl huddle closer to male companion-as they enter one on their walk in the garden. (and what with the privacy they offer.. who know what will happen next!)

grotesque had expanding beyond grotto like, and often mean unsightly, unpleasant in the extreme, vile, slimy, and devoid of any aspect of pleasure.

-and i most definately agree that grotty is a form of grotesque! but words do that don't they?