PCS

*ŝnˀ - to hate (Kogan 2015: 201)

a cognate relationship may be surmised for Mhr. ŝūna ‘to be unkind, to humiliate,’ ŝatna ‘to look unwell, to have an ill-favored countenance, to be unpleasant to behold,’ əŝtōna ‘to look unwell, to be illfavored’

Akkadian
šannāˀu - one who hates (CAD Š₁ 388, AHw. 1164)
Probably a WS loanword.
Ugaritic
šnˀ - to hate, loathe (DUL 832)
Ugaritic
šnˀu - enemy (DUL 832)
Hebrew
ŝnˀ - to hate (HALOT 1338)
Syriac
sny - to hate (LSyr. 483, SL 1023)
Arabic
šnˀ - to hate (Lane 1603)
Sabaic
s₂nˀ - personal enemy, ill-wisher (SD 133)
Qatabanian
s₂nˀ - enemy (LIQ 169)