Exasperating
Part of speech: adjective
Definition: That exasperates, infuriates, annoys or irritates
Part of speech: verb
Definition: To tax the patience of, irk, frustrate, vex, provoke, annoy; to make angry.
Vexing
Part of speech: verb
Definition: To trouble aggressively, to harass.
Example sentence: There's an urgent need to stop reacting to each immediate vexing issue in isolation. Such response often creates unanticipated second-order effects and even more problems for us.