Sadness: n. sensing a small intensity mental displeasure frequently because of the loss and/or departure of a subset(s)
Sadness is a form or subset of unhappiness which is less intense than grief and is an emotional response to losing something of value, having to leave an enjoyable circumstance, or having to say goodbye to a dear human or playmate.
What causes grief in some humans only causes sadness in others frequently because there has not been a strong enough attachment or bond.
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