at the very least, at a minimum / in any case, at any rate, either way, anyway

to say the least

(informal) to be a near thing, to be a close call

unless

(derogatory) a nobody, a nonentity, chopped liver (unimportant person) / (derogatory) a nobody, a nonentity, chopped liver (unimportant person); a drudge (person who works in a low job)

much less, let alone

nothing less than, nothing short of

least significant bit (bit of the smallest order)

plural of bit le moins significatif

(informal) in no time, in two shakes, in a flash, in a jiffy