1) About to snap 2) All tensed up 3) All wound up 4) Anxious 5) Apprehensive 6) Apt to snap 7) At the forefront of fashion 8) Atwitter 9) Avant-garde 10) Being in a tense state 11) Bold and provocative 12) Boldly innovative 13) Boldly original 14) Boldly provocative 15) Boldly unconventional 16) Bordering on poor tatse 1) Antsy 2) Fidgety 3) Jittery 4) Jumpy 5) Nervous 6) Nervy 7) Overstrung 8) Restive 9) Restless 10) Stressed 11) Tense 12) Uptight 13) Wired 14) Uneasy 
• (a.) Having some of the forms, such as drapery or the like, too sharply defined. • (a.) Easily irritated; sharp; as, an edgy temper.
Edg'y adjective [ From Edge .] 1. Easily irritated; sharp; as, an edgy temper. 2. (Fine Arts) Having some of the forms, such as drapery or the like, too sharply defined. 'An edgy style of sculpture.' Hazlitt. 
Edgy is British slang for nervous, irritable.
[adj] - being in a tense state
high-strung adjective being in a tense state