vex
Concise Oxford English Dictionary © 2008 Oxford University Press:
vex/veks/
▶verb make annoyed or worried. ▶adjective chiefly W. Indian angry; vexed.
– derivatives
vexation noun,
vexer noun,
vexing adjective,
vexingly adverb.
vexation noun,
vexer noun,
vexing adjective,
vexingly adverb.
– origin ME: from OFr. vexer, from L. vexare ‘shake, disturb’.
'vex' also found in these Oxford entries:

