1. Marked by firm determination or resolution; not shakable
   "unwavering loyalty"
   - firm, steadfast, steady, stiff, unbendable, unfaltering, unshakable, unshakeable 
2. Not showing abrupt variations
   - level

See also: resolute, steady, unwaveringly

• unbelieving
• unbelievingly
• unbeloved
• unbelt
• unbelted
• unbend
• unbendable
• unbending
• unbeneficed
• unbent
• unbiased
• unbiassed
• unbidden
• unbigoted
• unbind
• unbitter
• unbleached
• unblemished
• unblended
• unblessed
• unblinking
• unblinkingly
• unblock
• unbloody
• unblushing