wilful or (N American) willful /wilˈfŭl/

1. Self-willed, obstinate, headstrong
2. Deliberate, intentional
3. Willing (Shakespeare)

Wilfully

wilˈfully adverb

wilˈfulness noun

• aerodynamically
• aerodynamic braking
• aerodynamicist
• aerodynamicists
• aerodynamics
• aerodyne
• aerodynes
• aeroelastic
• aeroelastician
• aeroelasticians
• aeroelasticity
• aeroembolism
• aeroembolisms
• aero-engine
• aero-engines
• aerofoil
• aerofoils
• aerogel
• aerogels
• aerogenerator
• aerogenerators
• aerogram
• aerogramme
• aerogrammes
• aerograms