instabile meaning in English

rocky [rockier, rockiest]▼(easily rocked, see also: unstable)
adjective
[UK: ˈrɒk.i] [US: ˈrɑːk.i]

unstable▼(not stable)
adjective
[UK: ʌn.ˈsteɪb.l̩] [US: ʌn.ˈsteɪb.l̩]John is unstable. = John è instabile.

volatile▼((of a price etc) variable or erratic)
adjective
[UK: ˈvɒ.lə.taɪl] [US: ˈvɑː.lə.təl]