蒼然 is read as そうぜん (souzen) and means blue.
そうぜん
souzen
こしょくそうぜん
antique-looking
ぼしょくそうぜん
dusky
せきぜん
forlornness
ばくぜん
vague
かんぜん
boldly
noisy
せいぜん
orderly
げんぜん
grave
たいぜん
calm
むいしぜん
abandoning artifice and just being oneself
あんぜん
こうぜん
elated