sonder UK /ˈsɒndə/US /ˈsɑndɚ/ noun1 •The profound feeling of realizing that everyone, including strangers passing in the street, has a life as complex as one's own, which they are constantly living despite one's personal lack of awareness of it.I had a sonder, a realization that the random girl sitting next to me inside of Starbucks might have a fantastic life or she might be dealing with a very ill family member. — 2012