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comparative more skilful, superlative most skilful
Non-US (including but not limited to Australian, British, Canadian, Irish, Jamaican, South African and New Zealand) standard spelling of skillful. quotations examples
More than once have I spoken to willing listeners because of some one who had come under skilful kindly treatment in the hospital at Taiwan-fu.
1915, William Campbell, Sketches from Formosa, Marshall Brothers Limited, page 82