- purposely, purposefullyPurposely is the older word (15c) and means ‘on purpose, intentionally’
• (We've purposely changed our programmes on Tuesday to fit in with the Royal timetable —BBC Press Release, 2002 [OEC])whereas the more recent word purposefully (19c) corresponds to the adjective purposeful and means ‘with a strong purpose, resolutely’:
• He threw down a handful of sovereigns without even looking at Sam, then strode purposefully after the Squire —S. Langley, 2006.A third word, purposively (20c), means ‘for a particular purpose’, and is more usual in technical contexts:
• Socialism…would have to be built by active human beings working purposively and creatively —J. Dignan et al., 1992.Occasionally purposively is used when purposefully is probably meant:
• ‘Gerrart-of-it!’ said the larger of the two, moving purposively towards me —Will Self, 1993.
Modern English usage. 2014.