Sadness is the feeling of being unhappy, hurt, or low in spirit. It can be mild or deep and may come from loss, disappointment, or empathy for others.
Built from *sad* plus the noun-forming suffix *-ness*, which turns adjectives into states or qualities. It follows the same historical path as *sad*, from 'fullness' to emotional heaviness.
Sadness isn’t just the opposite of joy; it’s often a sign that something mattered to you. The language treats it as a 'state' you can be in, not your whole identity—something that comes and goes. That tiny *-ness* turns a momentary feeling into a landscape you can move through.
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