спонтанный angolul

impromptu▼(improvised)
adjective
[UK: ɪm.ˈprɒmp.tjuː] [US: ˌɪm.ˈprɑːmp.tuː]

spontaneous▼(self generated; happening without any apparent external cause)
adjective
[UK: spɒn.ˈteɪ.nɪəs] [US: spanˈteɪ.niəs]