bedevil (
http://definr.com/bedevil)
v 1: annoy constantly [syn:
torment,
rag,
crucify,
dun,
frustrate]
2: be confusing or perplexing to; cause to be unable to think
clearly: "These questions confuse even the experts"; "This
question completely threw me"; "This question befuddled
even the teacher" [syn:
confuse,
throw,
fox,
befuddle,
fuddle,
confound,
discombobulate]