1) At bottom 2) At heart 3) Essentially 4) Fundamentally 5) In essence 6) Just 7) Mainly 1) At heart 2) Au fond 3) Deeply 4) Essentially 5) Fundamentally 6) In essence 7) Necessarily 8) Primarily 9) Roughly 10) Simply 11) Unsophisticatedly 12) Vitally 
[adv] - at bottom or by one`s (or its) very nature
fundamentally adverb at bottom or by one`s (or its) very nature; `He is basically dishonest`; `the argument was essentially a technical one`; `for all his bluster he is in essence a shy person`