инертный angolul

sluggish▼(having no power to move oneself or itself; inert)
adjective
[UK: ˈslʌ.ɡɪʃ] [US: sˈlʌ.ɡɪʃ]

inert gas [inert gasses]▼(non-reactive gas)
noun
[UK: ɪ.ˈnɜːt ɡæs] [US: ˌɪ.ˈnɝːt ˈɡæs]