to conjecture; to comprehend; to surmise; to understand; to estimate
to find difficult to guess; to struggle to work out; to be unable to figure out
unfathomable; inestimable; immeasurable
to find difficult to guess; to struggle to work out; to be unable to figure out
to measure over again; to reweigh
to weigh on a scale; to weigh up options; to compare pros and cons
selling by measure; selling by weight; selling by volume