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comparative more difficile, superlative most difficile
(obsolete) Hard to work with; stubborn.
(obsolete) Difficult. quotations
[…] forasmuch as he was to judge of an internall beauty, of a difficile knowledge, and abstruse discovery.
1603, Michel de Montaigne, translated by John Florio, The Essayes […], London: […] Val[entine] Simmes for Edward Blount […]