Fulsome
.“Ful” is the Anglo-Saxon fúl (foulness), not ful (full); “some” is the affix meaning united with, the basis of something; as, gladsome mettlesome, gamesome, lightsome, frolicsome, etc., etc.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.