Vexing
Definitions
Causing annoyance, frustration, or worry.
Difficult to deal with or resolve; puzzling.
Examples
The constant buzzing of the mosquito was incredibly vexing while I tried to sleep.
It is a vexing problem that has puzzled scientists for several decades.
Synonyms
Annoying Irritating Frustrating Bothersome Troublesome Exasperating Aggravating
Antonyms
Pleasing Soothing Comforting Delightful Satisfying Calming Relaxing