spontaneous
UK /spɒnˈteɪ.ni.əs/ · US /spɑnˈteɪ.ni.əs/ adjective
- adjective Self-directed; happening or acting without external cause or instigation; proceeding from natural feeling, temperament, or momentary impulse. “He made a spontaneous offer of help.”
- adjective Done by one's own free choice, or without planning.
- adjective Controlled and directed internally; self-active; spontaneous movement characteristic of living things.
- adjective Produced without being planted or without human cultivation or labor.
- adjective Sudden, without warning.
- adjective Said or done without prior planning or prior writing. “He made spontaneous remarks in the court, after being asked an unexpected question.”
Synonyms
autonomous automatic involuntary natural unforced impulsive extemporaneous unpremeditated unprompted unwritten abrupt precipitous subitaneous precipitant precipitate sudden suddent self-generated ad-lib
Antonyms
induced stimulated voluntary calculated deliberate planned premeditated
Etymology
Learned borrowing from Late Latin spontāneus.
Webster’s 1913
- adjective Proceding from natural feeling, temperament, or disposition, or from a native internal proneness, readiness, or tendency, without constraint; as, a spontaneous gift or proportion.
- adjective Proceeding from, or acting by, internal impulse, energy, or natural law, without external force; as, spontaneous motion; spontaneous growth.
Etymology [L. spontaneus, fr. sponte of free will, voluntarily.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “spontaneous”, CC BY-SA 4.0. Details