million dollar question (noun) sixty-four-thousand-dollar question: very crucial question
Sinonime: great, illimitable,
immeasurable, immense, incalculable,
indefinite, inexhaustible, infinite,
limitless, measureless, no catch, no end of, no end to, no holds barred, no strings, no strings attached,
tremendous, unbounded, unconfined, unending,
unlimited, untold, vast, wide open
Antonime: limited,
restricted