tranquil   
adana
slow, peaceful, tranquil; grave and prudent in action. Root not used in Imerina. [Mal. Adu, to repose (?).] [Richardson 1885]
tranquillité, bonheur [Hallanger 1974]
mitaboneka
to be tranquil, to rest easy [Richardson 1885]
oronorona
an easy, tranquil and prosperous state [Richardson 1885]