adj. 25B6; adjective DIFFICULT, hard, taxing, troublesome, tricky, awkward, controversial, ticklish, complicated, complex, knotty, thorny, prickly, vexed; informal sticky; Brit. informal dodgy.
easy, simple, straightforward.
PROBLEMATIC
Meaning of PROBLEMATIC in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012