Verb (5-dan, る, intransitive)
1. to taper to a point; to become pointed; to become sharp
その先端は尖っているように見えた。The tip looked pointed.
2. to be on edge; to be nervous; to be irritable; to be touchy
神経が尖っている。I am on edge.
3. to be sharp (of a voice, words, etc.); to be harsh; to be angry; to look displeased; to look sour
彼女の声はかすかに尖っていた。Her voice had a slight edge to it.
4. to be provocative; to be radical; to be rebellious