Noun sadness has 2 senses
  1. sadness, unhappiness - emotions experienced when not in a state of well-being
    --1 is a kind of feeling
    Antonyms: happiness
    --1 has particulars:
     dolefulness; melancholy; misery; forlornness, loneliness, desolation; weepiness, tearfulness; sorrow; sorrow, regret, rue, ruefulness; cheerlessness, uncheerfulness; depression; downheartedness, low-spiritedness, dispiritedness
  2. sadness, sorrow, sorrowfulness - the state of being sad; "she tired of his perpetual sadness"
    --2 is a kind of unhappiness
    --2 has particulars: mourning, bereavement; poignance, poignancy
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