hollow
adjective
ˈhɒləʊ 
ˈhɑːloʊ 
1 having a hole or empty space insidea hollow ball/centre/tubeThe tree trunk was hollow inside.Her stomach felt hollow with fear.2 (of parts of the face) sinking deeply into the facehollow eyes/cheekshollow-eyed from lack of sleep3 [usually before noun] (of sounds) making a low sound like that made by an empty object when it is hita hollow groan4 [usually before noun] not sincerehollow promises/threatsa hollow laughTheir appeals for an end to the violence had a hollow ring.5 [usually before noun] without real valueto win a hollow victory Idioms
see ring true/hollow/false at ring2 verbhollowly ˈhɒləʊli ˈhɑːloʊli ˈhɒləʊnəs ˈhɑːloʊnəs 