con·sist·ent

/kənˈsistənt/
adjective: consistent

acting or done in the same way over time, especially so as to be fair or accurate.

  1. unchanging in nature, standard, or effect over time.
  2. compatible or in agreement with something.
  3. (of an argument or set of ideas) not containing any logical contradictions.

Origin
consistent origin

late 16th century (in the sense ‘consisting or composed of’): from Latin consistent- ‘standing firm or still, existing’, from the verb consistere