Not variable; unalterable; uniform; always having the same value.
Constant.
That cannot undergo inflection, conjugation or declension.
Something that does not vary; a constant.
said of a function that either never decreases or never increases as its independent variable increases.
Uttered in a monotone; monotonous.
of or using the Greek system of diacritics which discards the breathings and employs a single accent to indicate stress. It replaced polytonic system in 1982.