spontaneous
[adjective]
Synonyms: unplanned, impromptu, impulsive, instinctive, natural, unprompted, voluntary, willing

---

Antonyms: premeditated
Contrasted words: deliberate, intended, intentional, planned, predetermined, preplanned, studied, thought-out, voluntary, willed, willful, forced, prompted, conventional, formal, stylized
Related Words: unconstrained, unforced, unreasoned, unstudied, extemporaneous, extempore, impromptu, improvised, offhand, natural, simple, unsophisticated

[TahlilGaran] English Synonym Dictionary ▲

spon‧ta‧ne‧ous /spɒnˈteɪniəs $ spɑːn-/ adjective
[Date: 1600-1700; Language: Late Latin; Origin: spontaneus, from Latin sponte 'of your own free will']

1. something that is spontaneous has not been planned or organized, but happens by itself, or because you suddenly feel you want to do it:
The crowd gave a spontaneous cheer.
My spontaneous reaction was to run away.

2. someone who is spontaneous does things without planning them first – used to show approval
—spontaneously adverb:
She laughed spontaneously.
—spontaneity /ˌspɒntˈniːəti, ˌspɒntˈniːɪti, -ˈneɪəti $ ˌspɑːn-/ noun [uncountable]

[TahlilGaran] Dictionary of Contemporary English ▲

spontaneous
adj.
VERBS appear, be, seem
ADV. genuinely | quite, totally | apparently, seemingly | wonderfully a wonderfully spontaneous performance of the symphony

[TahlilGaran] Collocations Dictionary ▲