How to say unshakeable in Japanese

確固不動【かっこふどうkakkofudou】確乎不動: ~の noun / noun:
unshakeable (e.g. belief); invincible; steadfastness; firmness; unwavering (e.g. support); absolutely secure - four character idiom

Example Sentences

下手にhetani 手te をwo 動かすugokasu とto 気付かれてkizukarete しまうshimauとtoいうiu 強迫観念kyouhakukannen がga 俺ore をwo 襲うosou。: I was assailed by the stupid, but unshakeable, idea that if I was imprudent enough to move my hand I'd be noticed.

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