...involuntario, -a, involuntary... 
Gustavo Adolfo Becquer 「Legends, Tales and Poems」
... At times hestartled even himself and sent the lesser creatures of the wild junglescampering to their hiding places as involuntary roars and growlsrumbled from his throat...
Edgar Rice Burroughs 「The Beasts of Tarzan」
...Tarzan saw the involuntary movement and shook his head...
Edgar Rice Burroughs 「Tarzan the Untamed」
...It had been an almost imperceptible action on her part and certainly an involuntary one, for she did not wish to betray a single thought or emotion, until she knew what he wished to say...
Baroness Emmuska Orczy 「The Elusive Pimpernel」
...The same involuntary and sad acknowledgment of a lower order of being appears in their whole intercourse with the whites...
Horatio Bridge 「Journal of an African Cruiser」
... He had noticedthe gentleman's involuntary pause and his interest in the oppositehouse, and had stopped work for a moment to watch the stranger as hewent on down the street...
Charles W. Chesnutt 「The House Behind the Cedars」
...“It’s grotesquely simple,” said Hastings,and there was an involuntary tingeof bitterness in the tone he tried to keepeven...
Various 「Ainslee's magazine, Volume 16, No. 3, October, 1905」
...The act of tumbling seems to be one over which they have no control, an involuntary movement which they seem to try to prevent...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...They may indeed contain a good dose of involuntary suggestion, active or passive...
Henny Kindermann Agnes Blake 「Lola」
...The muscular tissue of the heart belongs to that class known as involuntary,because its action is not controlled by the will...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Baree's quest for Nepeese became now more or less involuntary, a sortof daily routine...
James Oliver Curwood 「Baree, Son of Kazan」
...Presently two came directly towards him, and though he did notventure to look up, I saw, by an involuntary motion of his ears, thatthose quick organs had already warned him of their approach...
R. Lee 「Anecdotes of the Habits and Instinct of Animals」
...Presently two camedirectly towards him, and though he did not venture to lookup, I saw, by an involuntary motion of his ear, that thosequick organs had already warned him of their approach...
Various 「Natural History in Anecdote」
..." Our circumstances, inspiration, artistic attitude,are involuntary and possess us as our other belongings do...
W. C. Brownell 「French Art」
...So this was what happened to intrudersfrom the upper world! TheConquistadore who kept his long watchbeside the geyser was not the only one!Kirby felt an involuntary chill prickleup his back...
Various 「Astounding Stories of Super-Science, December 1930」
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