groundbreaking
From Longman Dictionary of Contemporary Englishgroundbreakingground‧break‧ing /ˈɡraʊndˌbreɪkɪŋ/ adjective NEWgroundbreaking work involves making new discoveries, using new methods etc groundbreaking researchExamples from the Corpusgroundbreaking• Other groundbreaking work was reportedly done in the areas of fault tolerance support and compiler optimisation.