Haw. Rev. Stat. § 526-10 – Disclaimer by appointee, object, or taker in default of exercise of power of appointment.

(a) A disclaimer of an interest in property by an appointee of a power of appointment takes effect as of the time the instrument by which the holder exercises the power becomes irrevocable.
(b) A disclaimer of an interest in property by an object or taker in default of an exercise of a power of appointment takes effect as of the time the instrument creating the power becomes irrevocable.

[L 2000, c 43, pt of §1]