bitter   
madiro
acid, tart, bitter, sour [Richardson 1885]
mafaitra
bitter, brackish, disagreeable [Richardson 1885]
bitter; cf. [Hallanger 1973]
mafaraka
rancid, bitter [Hallanger 1973]
mangerokeroka
to be bitter, to leave a bitter taste in the throat [Hallanger 1973]
mangidy
bitter [Richardson 1885, Hallanger 1973]
monta
bitter; used of fruits [Richardson 1885]
vaky afero
fig. bitter, greatly ashamed [Richardson 1885]