"deemed insignificant" is correct and usable in written English.
You could use it to mean that something is judged or thought to be unimportant. For example: The small details of the contract were deemed insignificant, so they were not given much attention.
The absence of needle marks Hirsch deemed insignificant, because clean needles cause less scarring.
Whereas myriad phytochemicals have been shown to inhibit these processes in vitro, translation to the clinic has been deemed insignificant or undetermined.
Standing at his locker, another Yankee addressing another injury, none of which can been deemed insignificant, Pettitte was asked if his back worried him.
Both spills were contained and deemed insignificant, since there happened to be low risk to human life and the environment at that time, but the Mountain Pass site stopped producing several years later.
Any promises that may or may not have been made about closing dates were also deemed insignificant, unless they were made in the offering plan or in the contract.
Ensuring no net loss of wetlands requires consideration of the direct, indirect, and potentially induced effects of development; however, many projects that affect wetlands are often deemed insignificant and do not trigger any formal environmental assessment process.
Other lossy compression methods allow for finer control over compression parameters, generally relying on discarding signal components the coder deems insignificant.
"A failure to acknowledge the central role of slavery in the Confederacy and deeming insignificant the reprehensible transgression of moral standards of liberty and equality that slavery represented is simply not acceptable in the America of the 21st century".
Mean difference scores were also less than the 0.36°F deemed clinically insignificant by authors Stephen and Sexton [ 66] and 0.2°C deemed clinically insignificant by Fulbrook [ 58] when he compared axillary and pulmonary artery temperature readings.
(The difference was deemed statistically insignificant).
Their audience was deemed an insignificant threat.
