unwavering

(s) marked by firm determination or resolution; not shakable
- firm convictions
- a firm mouth
- steadfast resolve
- a man of unbendable perseverence
- unwavering loyalty
firm, steadfast, unbendable, unfaltering, unshakable, steady, stiff,
(s) not showing abrupt variations
- spoke in a level voice
- "she gave him a level look"- Louis Auchincloss
level,

firm steadfast unbendable unfaltering unshakable steady stiff level

unwaveringly