Another word for spontaneous
involuntary, instinctive, unbidden, unplanned, impromptu, ad-lib*, casual, unintentional, impulsive, offhand, automatic, unforced, natural, inevitable, irresistible, unavoidable, resistless, unwilling, unconscious, uncontrollable.
spontaneous applies to that which is done so naturally that it seems to come without prompting or premeditation a spontaneous demonstration; impulsive applies to that which is prompted by some external incitement or sudden inner inclination rather than by conscious rational volition an impulsive retort; instinctive suggests an immediate, unwilled response to a stimulus, as if prompted by some natural, inborn tendency he took an instinctive liking to her; involuntary refers to that which is done without thought or volition, as a reflex action an involuntary scowl, an involuntary flicker of the eyelid; automatic suggests an unvarying, machinelike reaction to a given stimulus or situation an automatic response
Another word for spontaneousadjective
Acting or happening without apparent forethought, prompting, or planning:automatic, impulsive, instinctive, involuntary, reflex, unpremeditated. See planned
Done by one's own choice:free, uncompelled, unforced, volitional, voluntary, willful. See willing
Unconstrained by rigid standards or ceremony:casual, easy, easygoing, informal, natural, relaxed, unceremonious, unrestrained. (Informal) laid-back. See plain, tighten