quieta

Usage notes
Kalma indicates a completely passive and material state that does not move: maro kalma a calm sea (i.e. not agitated by the wind). Tranquila has the sense of simultaneously material and mental, but preferably active: which does not agitate itself, does not move itself without usefulness or reason: vicini tranquila tranquil neighborhoods (which are not noisy). Lastly, expresses a mental state, better defined by its opposition  and.