Definify.com

Webster 1913 Edition

Verb.

[

imp. & p. p.

Bedevilled

([GREEK]);

p. pr. & vb. n.

Bedeviling

Bedevilling

To throw into utter disorder and confusion, as if by the agency of evil spirits; to bring under diabolical influence; to torment.

Bedeviled

and used worse than St. Bartholomew.

Sterne.

To spoil; to corrupt.

Wright.

bedevil ‎(third-person singular simple present bedevils, present participle bedeviling or bedevilling, simple past and past participle bedeviled or bedevilled)

To harass or cause trouble for; to plague.
Guerrilla attacks continued to bedevil the larger army's supply routes.
To perplex or bewilder.

to harass

The spellings bedeviling and bedeviled are preferred in the US, while bedevilling and bedevilled are preferred in the UK. However, the choice of spellings is not universal.