involuntary
[adjective]
Synonyms: unintentional, automatic, instinctive, reflex, spontaneous, unconscious, uncontrolled, unthinking

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Antonyms: voluntary
Related Words: unintended, unintentional, unwitting

[TahlilGaran] English Synonym Dictionary ▲

in‧vol‧un‧ta‧ry /ɪnˈvɒləntəri $ ɪnˈvɑːlənteri/ adjective
[Word Family: verb: volunteer; noun: volunteer; adverb: voluntarily ≠ involuntarily; adjective: voluntary ≠ involuntary]

1. an involuntary movement, sound, reaction etc is one that you make suddenly and without intending to because you cannot control yourself:
When Willie tapped on the window, Miguel gave an involuntary jump.

2. happening to you although you do not want it to:
involuntary part-time workers
—involuntarily adverb

[TahlilGaran] Dictionary of Contemporary English ▲