tranquil   
adana
slow, peaceful, tranquil; grave and prudent in action. Root not used in Imerina. [Mal. Adu, to repose (?).] [1.2]
tranquillité, bonheur [1.8]
mitaboneka
to be tranquil, to rest easy [1.2]
oronorona
an easy, tranquil and prosperous state [1.2]