n.: make sure/certain, reliable, in all verity, I (can) tell yon (=let me tell you), ByGeorge, without fault, sure enough, for a cert, and all, truth, surety, sureness, solidity, reliability, positivity, inerrability, certitude, assuredness
v.: emphatically
adj.: real, positive quality or quantity, true
adv.: so, definitely, certainly, really, even, indeed, plunk, undoubtedly