1. Without variation or change, in every case
   "constantly kind and gracious";
   - invariably, always
    
2. At all times or very frequently; throughout time or repeatedly without apparent end
   "the world is constantly changing";
   - always, forever, perpetually, incessantly, unremittingly
    
3. In a consistent, accurate, and trustworthy manner; without fail or interruption
   "She constantly supported her friends";
   - faithfully, dependably, reliably

Encyclopedia: Constantly