The term 'not casual' can be described by the following crossword solutions: DRESSY (6 letters), FORMAL (6 letters), FUSSY (5 letters), DESPERATE (9 letters), and PREMEDITATED (12 letters). DRESSY implies a level of sophistication and elegance, while FORMAL suggests a more structured and traditional approach. FUSSY implies an excessive attention to detail, and DESPERATE implies a sense of urgency or need. Finally, PREMEDITATED implies that something was planned in advance. All of these words together suggest a level of seriousness and intentionality that is not casual.