稳如泰山 (wěn rú tài shān) | Meaning: steady as Mt Tai | Chinese Idiom with Pinyin & Origin

solid as a boulder (idiom); absolutely secure · rock-firm and unyielding坚如磐石jiān rú pán shí

to not move a single jot (idiom)纹丝不动wén sī bù dòng

calm · cool镇静zhèn jìng

stable · steady · firm · to stabilize稳固wěn gù

(idiom) (usu. of sth abstract: an alliance, a conviction etc) unbreakable; rock-solid牢不可破láo bù kě pò

steady as Mt Tai · as safe as houses