确信的

确实的

一定的（形容词sure的最高级 ）

a having or feeling no doubt or uncertainty; confident and assured

s exercising or taking care great enough to bring assurance

a certain to occur; destined or inevitable

s physically secure or dependable

s reliable in operation or effect

s (of persons) worthy of trust or confidence

s infallible or unfailing

s certain not to fail

s impossible to doubt or dispute