Vexatious

vexa·tious (-s̸həs)

adjective

1. characterized by or causing vexation; annoying, troublesome, etc

modif.

1. annoying, bothersome, irritating; see disturbing.

Example:
As I was traveling from Marikina to Malate, the VEXATIOUS driver of the cab I was fortunate to ride in today, almost got us both killed - several times (must be some stomach problem or something on his part).