wilful
Concise Oxford English Dictionary © 2008 Oxford University Press:
wilful /ˈwɪlfl/ (US also willful)
▶adjective
- 1 intentional; deliberate.
- 2 stubborn and determined.
– derivatives
wilfully adverb,
wilfulness noun.
wilfully adverb,
wilfulness noun.
'wilful' also found in these Oxford entries:

