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"sad" is also used as a crossword clue. If that's what you saw, the answer is often unhappy (7 letters).
Definitions
Unhappy, sorrowful, unfortunate, or causing regret.
Word origin
From Middle English sad, from Old English sæd (“satisfied, full, sated, unable to handle more, weary”), from Proto-West Germanic *sad, from Proto-Germanic *sadaz (“sated, satisfied”), from Proto-Indo-European *seh₂- (“to satiate, satisfy”).
Used in a sentence
“She gets sad when he's away.”
“Firſt were we ſad, fearing you would not come, / Now ſadder that you come ſo vnprouided:[…]”
“[…]Th’ Angelic Guards aſcended, mute and ſad[…]”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer7 curated clues
01“Blue, emotionally”3 letters
02“Downcast”3 letters
03“Feeling blue”3 letters
04“Feeling unhappy”3 letters
05“Low in spirits”3 letters
06“Not cheerful”3 letters
07“Unhappy”3 letters
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