What is Wilfully?

Legal Definition
Intentionally.

2. In charging certain offences it is required that they should be stated to be wilfully done. Arch. Cr. Pl. 51, 58; Leach's Cr. L. 556.

3. In Pennsylvania it has been decided that the word maliciously was an equivalent for the word wilfully, in an indictment for arson. 5 Whart. R. 427.
-- Bouviers Law Dictionary