different between bluish vs sirius

English

From Middle English blewissh, blewisch (also Middle English bloysh), equivalent to blue +? -ish.

bluish (comparative more bluish, superlative most bluish)

Having a tint or hue similar to the colour blue.
(figuratively) Somewhat depressed; sad.
- 2009, John Wooden, Jay Carty, Coach Wooden One-On-One
  To this day, I usually read my Bible a couple of times a day, and I still enjoy attempting to express my feelings through poetry, especially when I'm feeling bluish.

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