From Longman Dictionary of Contemporary Englishvaliantval‧i‧ant /ˈvæliənt/ adjective BRAVEvery brave, especially in a difficult situation SYN courageous Tarr threw himself in front of a train in a valiant effort to save the child.
Examples from the Corpus
valiant• No outcome seems too impossible or, at least, unworthy of valiant effort.• Despite valiant efforts, firemen were unable to save the house.• The Forestry Commission are making valiant efforts to re-create these old woodlands, and are trying to preserve the little that remains.valiant effort• No outcome seems too impossible or, at least, unworthy of valiant effort.• Despite valiant efforts by our physiotherapists, my hamstring did not recover in time for the 200 metres.• A great deal of bomb debris still remains to be cleared, but valiant efforts have been made to remove refuse.• At least that's what I gather from watching Art Jacobson's futile but valiant efforts to build community on the Internet.• We do not therefore believe the draft guidance, despite valiant efforts to convince, has fully embraced the concept of sustainability.• The Forestry Commission are making valiant efforts to re-create these old woodlands, and are trying to preserve the little that remains.• Impressions gleaned in childhood and rein forced in adolescence cling like limpets into adulthood despite valiant efforts to shake them off.Origin valiant (1300-1400) Old French present participle of valoir “to be of worth”, from Latin valere; → VALOR 