a dearth of explicative material to help the layman understand the difficult subject matter
Recent Examples on the WebMuch of the dialogue is obvious and explicative; young Bode sometimes sounds like a middle-aged professor. Kelly Lawler, USA TODAY, 7 Feb. 2020 There are periodic explicative orations about the state of the nation. Sophie Gilbert, The Atlantic, 1 Nov. 2019
Word History
Etymology
borrowed from New Latin explicātīvus, from Latin explicātus, past participle of explicāre "to free from folds or creases, unroll, spread out, set out in words" + -īvus-ive — more at explicate
Note: The word explicātīvus is categorized as Medieval Latin in Oxford English Dictionary, third edition, though the word is not an entry in Dictionary of Medieval Latin from British Sources or Mittellateinisches Wörterbuch.