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

• rapper
• rapport
• rapporteur
• rapprochement
• rapscallion
• rapt
• raptly
• raptness
• raptor
• Raptores
• raptorial
• raptorial bird
• rapture
• rapturous
• rapturously
• raptus
• raptus hemorrhagicus
• rara avis
• rare
• rare bird
• rare earth
• rare-earth element
• rare-roasted
• rarebit
• raree-show