For a general sense of being on the cutting edge or controversial:
* Avant-garde
* Daring
* Cutting-edge
* Trendsetting
* Groundbreaking
* Pioneering
* Provocative
* Bold
* Unconventional
* Radical
For a sense of being rebellious or cool:
* Cool
* Hip
* Alternative
* Underground
* Rebellious
* Nonconformist
* Sharp
* Gritty
For a sense of being tense or unsettling:
* Uneasy
* Nervous
* Uncomfortable
* Disturbing
* Intense
* Sharp
* Tense
For a sense of being sharp or well-defined:
* Sharp
* Crisp
* Defined
* Angular
It's important to choose the synonym that best fits the specific meaning you want to convey.