In the sense of needing much effort or skill to accomplish, deal with, or understand I find maths very difficult Synonyms problematic • hard • puzzling • baffling • perplexing • confusing • mystifying • mysterious • complicated • complex • involved • intricate • knotty • thorny • ticklish • obscure • abstract • abstruse • recondite • enigmatic • impenetrable • unfathomable • over one's head • above one's head • beyond one •...