mendacious, untruthful, prevarication, fabrication, lieing, sitting, laying, fibbing, sleeping, lyin, more...

truthful, honest, sincere, genuine, factual

white lie, fib, tall tale, exaggeration, outright lie, half-truth, more...

low, political, side, pathological, silly, deep, prone, flat, high, gross, hard

making things up,   making stuff up,   bending the truth,   pinocchio's problem,   falsely claiming,   making up something,   making up stories,   eschewing the truth,   denying the truth,   not being truthful