halcyonic

totally calm and especially chill; not causing harm to anyone; very peaceful

I don't believe he started the fight, that dude is so halcyonic.

halcyonic by Hal Cyonic March 15, 2015

Halcyonic Planet

Any planet in a halcyonic system (i.e. KMT-2020-BLG-0414L b, WD1054–226 b, WD 1856 b, etc.)

There are also halcyonic dwarf planets, the only example of which is WD 1145+017 b.

In 2020, we discovered the first halcyonic planet around a white dwarf.

Halcyonic Planet by An_Idot September 21, 2024

Halcyonic System

Any solar system orbiting an object that was once a main sequence star, but isn't anymore (i.e. black holes, white dwarves, red giants, magnetars, pulsars, etc.).

The solar system will become a halcyonic system as the Sun dies.

Halcyonic System by An_Idot September 21, 2024

Halcyon 

Meaning a period of time in the past thought to be peaceful and pleasant

the halcyon days of Freshman high... (said no one ever)

Halcyon by Girei August 10, 2018

Halcyon Days 

Almost literally means the "calm before the storm", but can also be used to signify joy, tranquility, etc.

Goodbye Halcyon Days.

Halcyon Days by Kaba April 17, 2008

Halcyon 

An all around great person who is always willing to listen and checks in on you. They're an amazing person and be happy if you have them as a friend. Their name shows their uniqueness and individuality. As well as their peacefulness that they hold.

Damn hanging out with Halcyon was so nice. I gotta hangout with them more.

Halcyon by hollow_gravity♡ June 29, 2021

halcyon 

sleep pill, makes u pass out in about 30 seconds

wow i just took this......zzzzzzz

halcyon by Zer0 Racer January 26, 2003