is friends (verb) associate: befriend
Sinonime: all-powerful,
arduous,
awesome, ballbuster, challenging,
colossal, dismaying, effortful,
great,
hard,
impressive,
indomitable,
intimidating, labored, laborious, mammoth,
mighty, murder*, onerous, overpowering,
powerful, puissant, rough go, rough*,
staggering, strenuous, tall order, toilsome, tough proposition, tough*,
tremendous, uphill
Antonime: easy, not hard,
pleasant,
trivial