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.
Galling
Part of speech: adjective
Definition: vexing, humiliating
Part of speech: verb
Definition: To bother or trouble.