S / suspĭcax
adjective

suspĭcax

gen. suspĭcācis
apt to suspect; distrustful
apt to suspect, distrustful, suspicious.
Lit. (very rare): populus suspicax ob eamque rem mobilis, Nep. Timoth. 3, 5: frater, Liv. 40, 14: animus alicujus, Tac. A. 1, 13.—
that excites mistrust by extension
Transf., that excites mistrust, suspicious: silentium, Tac. A. 3, 11 fin.; Sen. Ira, 2, 29, 2 (dub.; bracketed by Haase).