Synonyms for «immense challenge»

enormous tremendous huge massive incredible monumental colossal overwhelming insurmountable great big daunting gigantic endless formidable difficult considerable significant intense extreme tough hefty impossible vast extraordinary insuperable high terrible unimaginable largest important amazing serious numerous mighty countless ambitious substantial insane whole little major arduous complex herculean wide hard new interesting

difficulty task problem obstacles competition achievement threat job project struggle hurdle work mission effort hardship opportunity endeavor risk experience amount promise scope complexity pressure responsibility goal journey strain assignment life battle burden adversity danger game stress scale future time adventure feat accomplishment change barrier demands undertaking potential courage skill