Methodic and Immutable
(a.) Alternative of Methodical.
Webster's Revised Unabridged Dictionary
adjective
- Not subject or susceptible to change or variation in form or quality or nature.
- usage: "the view of that time was that all species were immutable, created by God"
- synonyms: changeless
WordNet 3.0 © 2006 by Princeton University
Webster's Revised Unabridged Dictionary