1 grim, harsh, intense, oppressive, persistent, relentless, unabated, unalleviated, unbroken, undiminished, unmodified, unqualified, unredeemed, unrelieved
2 absolute, arrant, complete, consummate, deep-dyed (usually derogatory) downright, out-and-out, outright, perfect, rank, sheer, thorough, thoroughgoing, utter