Synonyms for «complicated subject»

intricate difficult complex convoluted tricky challenging delicate confusing troublesome problematic tough deep controversial huge various contentious heavy thorny much several varying simple sophisticated intense perplexing interesting hard different arduous big sensitive intriguing wide serious little painful diverse certain numerous touchy uncomfortable multiple considerable weighty easy broad vast whole overwhelming

topic matter issues task thing areas stuff article material question discussion problems content situation terms story piece process complexity details nature study work research argument concepts part cases relationship condition deal conversation job science system debate history answer project law life aspects book lot object combination information place ideas