A non-vocal cat.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

mewt literally translated into death, in maltese is used to when someone says or does something crazy

A homonym for 'mute' and name of an Indian credit company mewt.in