mistrustful

adjective4

1. •
   Having mistrust, lacking trust (in someone or something).

   • […] I hold it cowardice To rest mistrustful where a noble heart Hath pawn’d an open hand in sign of love — 1591
2. •
   Expressing or showing a lack of trust.

   • He lookt askew with his mistrustfull eyes, And nycely trode, as thornes lay in his way — 1590
3. •
   Having a suspicion, imagining or supposing (that something undesirable is the case).

   • The mender of roads was now coming to himself, and was mistrustful of having made a mistake in his late demonstrations; but no. — 1859
4. •
   (no longer used) Causing mistrust, suspicions, or forebodings.

   • Vp we gad, owt spredding oure sayls and make to the seaward: Al creeks mistrustful with Greekish countrye refusing. — 1582