The term 'not flashy' can be described by two crossword solutions: 'SOBER' (5 letters) and 'lowkeyed' (8 letters). Both words refer to a lack of ostentation or extravagance. 'SOBER' is an adjective meaning serious, restrained, and free from excess, while 'lowkeyed' is an adjective meaning restrained, subtle, and understated. Together, these words suggest a lack of showiness or attention-seeking behavior.