As adjectives the difference between clashier and flashier
is that clashier is (clashy) while flashier is (flashy).
clashier
English
Adjective
(head)
(clashy) clashy
English
Etymology 1
Adjective
(er)
(obsolete, regional) wet; rainy
(informal) that clash, that do not match or fit stylistically
Etymology 2
Corruption of khalasi.
Noun
(clashies)
(archaic) A khalasi. flashier
English
Adjective
(head)
(flashy)
flashy
English
Adjective
(
er)
Showy; visually impressive, attention-getting, or appealing.
- The dancers wore flashy costumes featuring shiny sequins in many vibrant colors.