Translation of "staunch" into Japanese

In his native Bessarabia, Nikifor had been a staunch Communist.

ニキフォルは,郷里のベッサラビアでは筋金入りの共産党員でした。

It was he who crowned the emperor, therefore expecting him to be a staunch defender of Orthodoxy.

総主教は皇帝に王冠を授けたので,皇帝が正教会の忠実な擁護者になることを期待しました。