Depending on context, ruhig can be translated as:
calm, calmly
quiet, quietly
serene, serenely
tranquil, tranquilly
peaceful, peacefully
Ruhig means quiet (no sound): still (motionless): steady (hand) or calm (composed,peaceful).
Farmer
ruhig
Common translations are "Sei still", and "Sei ruhig"
Ruhig Still Leise
z'eye roo'igg
Die Ruhe Die Stille as an imperative: Sei still/ruhig (informal) Seien Sie still/ruhig (formal)
Warum bist du so ruhig? (if you address a person you know) Warum sind Sie so ruhig? (that is the polite version when addressing a person of authority or a stranger)
Philipp Ruhig died in 1749.
Philipp Ruhig was born in 1675.
In German it's 'stille'==========================still, leise, ruhig, sanft, friedlich, schweigsam, geräuschlos, unauffällig
You can transfer it with "Bleib ruhig und mach weiter". It should be really close to your term.
In the context of a windless period it can be "Kalme", "Flaute", "Stille" or "Windstille". In the context of staying calm it can be "Gelassenheit", "gefasst", "gelassen", "ruhig" or "seelenruhig"
German equivalents of the English idiom Keep your shirt on! are:Mach mal die Pferde nicht scheu!Ruhig Blut!Reg dich nicht auf!Blieb locker!