be·dev·il 
/bɪˈdɛvəl/ verb
be·dev·ils; US be·dev·iled or British be·dev·illed; US be·dev·il·ing or British be·dev·il·ling /bɪˈdɛvəl/ verb [+ obj] : to trouble (someone or something) in a constant or repeated way : to cause repeated problems for (someone or something)
▪ The theory bedevils scientists, none of whom have been able to prove it true or false. ▪ The project has been bedeviled by problems since its inception.
▪ The theory bedevils scientists, none of whom have been able to prove it true or false. ▪ The project has been bedeviled by problems since its inception.
