They had powerful-but-finicky engines that were prone to spontaneous combustion.
From the online.wsj.com
Isn't the efflorescence of spontaneous, meaningful community cheering in itself?
From the economist.com
The 30-year-old Poppy is spontaneous and merry, but also occasionally foolhardy.
From the usatoday.com
Give me a few spontaneous phrases on each of your players, starting with Artest.
From the sacbee.com
So what's a spontaneous road tripper, equipped with a functioning palate, to do?
From the nytimes.com
We've all heard stories of people who owe their careers to a spontaneous switch.
From the businessweek.com
We find that spontaneous survivor colonies are not defective in septin assembly.
From the nature.com
On-demand optogenetic control of spontaneous seizures in temporal lobe epilepsy.
From the nature.com
Bone marrow cells adopt the phenotype of other cells by spontaneous cell fusion.
From the nature.com
More examples
Happening or arising without apparent external cause; "spontaneous laughter"; "spontaneous combustion"; "a spontaneous abortion"
Ad-lib: said or done without having been planned or written in advance; "he made a few ad-lib remarks"
(spontaneously) ad lib: without advance preparation; "he spoke ad lib"
Self generated; happening without any apparent external cause; Done by one's own free choice, or without planning; proceeding from natural feeling or native tendency without external constraint; arising from a momentary impulse; controlled and directed internally : self-active : spontaneous ...
(spontaneously) occurring without the help of an external agent
(Spontaneity) How comfortable you are with making plans at the last minute.
(Spontaneity) The copying is at the instance and inspiration of the individual professor, and the inspiration and decision to use the work, and the moment of its use for maximum teaching effectiveness, are so close in time that it would be unreasonable to expect a timely reply to a request for ...
(Spontaneity) employees display a willingness and readiness to approach customers actively and take care of their problems. They show they can think for themselves and do not just go by the book.
(Spontaneity) the capacity of an individual to give an adequate response to Glossary of Morenean terms 159F a new situation, or a new response to an old situation. ...