1. Conforming to the same principles or course of action over time 
2. Showing little if any change
   - static, stable

See also: consistent, unchangeable, unchangingness

• soulless
• soullessly
• sound
• sound alphabet
• sound asleep
• sound barrier
• sound bite
• sound bow
• sound camera
• sound effect
• sound film
• sound hole
• sound judgement
• sound judgment
• sound law
• sound off
• sound out
• sound perception
• sound pollution
• sound pressure
• sound pressure level
• sound projection
• sound property
• sound ranging
• sound recording