1, 2, 5, 6. Formal, academic, conventional may have either favorable or unfavorable implications. Formal may mean in proper form, or may imply excessive emphasis on empty form. In the favorable sense, academic applies to scholars or higher institutions of learning; it may, however, imply slavish conformance to mere rules, or to belief in impractical theories. Conventional, in a favorable sense, applies to desirable conformity with accepted conventions or customs; but it more often is applied to arbitrary, forced, or meaningless conformity.

Did you mean formal?