spontaneous
spontaneous adjective uk/spɒnˈteɪniəs/ ushappening naturally and suddenly and without being planned
спонтанный, стихийный
a spontaneous reaction The crowd broke into spontaneous applause. spontaneity noun [ U ] uk/ˌspɒntəˈneɪəti/ us
the quality of being spontaneous
спонтанность
The performance was boring and lacked spontaneity. spontaneous ly adverb
спонтанно