Definition of "mouthful"
mouthful1
noun
plural mouthfuls or mouthsful
Quotations
“Unquestionably his metabolism is unduly susceptible to stresses resulting from the interaction of external excitations,” he said, and Bobbie patted him on the shoulder in a maternal sort of way, a thing I wouldn't have cared to do myself though our relations were, as I have indicated, more cordial than they had been at one time, and told him he had said a mouthful.
1960, P. G. Wodehouse, Jeeves in the Offing, chapter VII
Something difficult to pronounce or say.
Quotations
Although there have been many examples of double names, three always have been uncommon. The L.S.W.R. had Horsley & Ockham & Ripley, but the South Yorkshire Railway produced a real mouthful in Smithley, Darley Main & Worsborough. This was soon found to be too much, and the name of the station became Dovecliffe.
1951 March, M. D. Greville, “The Nomenclature of Railway Stations”, in Railway Magazine, page 196
mouthful2
adjective
comparative more mouthful, superlative most mouthful
Quotations
The sufferers are regaled with such mouthful promises by every party on the eve of the successive elections and thereafter they continue to be shouted with unabated vigour by the party occupying the saddle while the problems are relegated to the limbo of time to find out their own solutions.
1980, The Economic Studies - Volume 21, page 7