v.
  - surprise or confuse. 
▸prove wrong.
 ▸defeat (a plan, aim, or hope).
 - 
(often be confounded with)
 mix up with something else.
 
exclam.
 informal, dated used to express annoyance:
 oh confound it, where is the thing?
 
  Etymology
  ME: from OFr. confondre, from L. confundere ‘pour together, mix up’; cf. confuse.