Strong's Definition
a primitive root; to be sick, i.e. (figuratively) distressed
KJV Usage: be full of heaviness
STEPBible — Tyndale Abridged Hebrew Lexicon
נוּשׁ (nush) — be sick. (Qal) to be sick
UBS Dictionary of Biblical Hebrew
verb
Grieve | verb qal
to be in despair = state in which humans see no way out of a difficult situation, ◄ as a result of a loss of confidence
UBS Dictionary of Biblical Hebrew © United Bible Societies, licensed CC BY-SA 4.0.
Brown-Driver-Briggs Hebrew Lexicon
[נוּשׁ] vb. be sick;—Qal ψ 69:21 ref