1. Without variation or change, in every case
   "constantly kind and gracious"
   - invariably, always 
2. Without interruption
   "the world is constantly changing"
   - always, forever, perpetually, incessantly, unremittingly

See also: constant

• breast drill
• breast feeding
• breast implant
• breast of lamb
• breast of veal
• breast pocket
• breast-deep
• breast-fed
• breast-high
• breastbone
• breasted
• breastfeed
• breastless
• breastpin
• breastplate
• breaststroke
• breaststroker
• breastwork
• breath
• breath of fresh air
• breathable
• breathalyse
• breathalyser
• breathalyze
• breathalyzer