1) As a minimum 2) At a minimum 3) At the minimum 4) Bottom line 5) By my lowest estimation 6) By the lowest estimation 7) If nothing else 8) In any case 9) In any event 10) Lead-in to a silver lining 11) Maybe even more 12) Minimally 13) No fewer than 14) No less than 15) Not less than 16) Not under 
[adv] - if nothing else 2. [adv] - not less than
leastwise adverb if nothing else (`leastwise` is informal and `leastways` is colloquial); `at least he survived`; `they felt--at any rate Jim felt--relieved though still wary`; `the influence of economists--or at any rate of economics--is far-reaching`...at the least adverb not less than; `at least two hours studying the manual`; `a tumor at least as big as an orange`