杳 ⇒
杳无音讯 杳无音信 yǎowúyīnxìn, [杳無音信], to have no news whatever
杳 yǎo, dark and quiet/disappear
冥 ⇒
冥 míng, [㝠], old variant of 冥[míng], dark/deep/stupid/the underworld
冥王星 Míngwángxīng, Pluto (dwarf planet)
冥想 míngxiǎng, to meditate/meditation
冥河 冥府 míngfǔ, underworld/hell
冥顽 míngwán, [冥頑], stupid/stubborn
苦思冥想 kǔsīmíngxiǎng, to consider from all angles (idiom); to think hard/to rack one's brains
冥顽不灵 míngwánbùlíng, [冥頑不靈], stupid/stubborn/pigheaded