The word for today is…
spontaneous (adjective) -
1: proceeding from natural feeling or native tendency without external constraint
2: arising from a momentary impulse
3: controlled and directed internally : self-acting
4: produced without being planted or without human labor : indigenous
5: developing or occurring without apparent external influence, force, cause, or treatment
6: not apparently contrived or manipulated : natural
Source : Merriam-Webster
Etymology : When English philosopher Thomas Hobbes penned his 1654 treatise Of Libertie and Necessitie he included the following: "all voluntary actions … are called also spontaneous, and said to be done by a man's own accord." Hobbes was writing in English, but he knew Latin perfectly well too, including the source of spontaneous; the word comes (via Late Latin spontāneus, meaning "voluntary, unconstrained") from the Latin sponte, meaning "of one's free will, voluntarily." In modern use, the word spontaneous is frequently heard in more mundane settings, where it often describes what is done or said without a lot of thought or planning.
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