1. Stubbornly; intentionally.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• wilfully,
• wofully,
• alfully,
• wilfull,
• wilful,
• willfull,
• wisfully,
• willfuly,
• qilfully,
• ailfully,
• eilfully,
• 3ilfully,
• 2ilfully,
• willfully,
• wilfullly,
• wilfullyy,
• workfull,
• wilfulliy,
• wilyfully,
• willfullyl

• wilfulness,
• willful,
• willfulness,
• wilful,
• wailful,
• willfully.

The adjective form of the word "wilfully" is "wilful".

The plural form of the word "wilfully" is "wilfully" as it is an adverb and does not have a distinct plural form.

The singular form of the word "wilfully" is "willful"