difficult

Synonyms: ambitious arduous backbreaker bothersome burdensome challenging crucial demanding difficile easier said than done effortful exacting formidable galling gargantuan hardwon heavy herculean immense intricate irritating labored laborious no picnic not easy onerous operose painful problem problematic prohibitive rigid severe stiff strenuous titanic toilsome tough troublesome trying unyielding uphill upstream wearisome

Antonyms: calm easy free manageable plain simple uncomplicated

Synonyms: abstract abstruse baffling bewildering complex confounding confusing dark deep delicate enigmatic enigmatical entangled esoteric formidable hard to explain hard to solve hidden inexplicable intricate involved knotty labyrinthine loose meandering mysterious mystical mystifying nice obscure obstinate paradoxical perplexing problematical profound puzzling rambling subtle tangled thorny ticklish troublesome unclear unfathomable unintelligible vexing

Antonyms: easy simple straightforward uncomplicated

Synonyms: argumentative bearish boorish dark demanding fastidious finicky fractious fussy grim hard to please impolite intractable irritable oafish obstreperous perverse picky refractory rigid rude tiresome tough troublesome trying unaccommodating unamenable

Antonyms: calm friendly sociable