IPA: /njuːˈtraɪnəʊlɛs/
KK: /njuˈtrɪnəˌlɛs/
Describing something that does not contain or involve neutrinos.
The experiment aimed to detect neutrinoless double beta decay, a process that is theorized to occur in neutrinoless environments.
Neutrinoless → It is formed from "neutrino" (from Italian *neutrino*, meaning little neutral one) and "-less" (meaning without). The word "neutrinoless" refers to a state or condition that is without neutrinos.
Think of 'neutrino' meaning a little neutral particle, and '-less' indicating the absence of something — so 'neutrinoless' means without neutrinos.
No commonly confused words.