incapable of being modified in form or character or strength (especially by making less extreme); "these variations from custom are illogical, incomprehensible, and unmodifiable"
not changeable or subject to change; "a fixed and unchangeable part of the germ plasm"-Ashley Montagu; "the unchangeable seasons"; "one of the unchangeable facts of life"
precisely determined or limited or defined; especially fixed by rule or by a specific and constant cause; "a determinate distance"; "a determinate number"; "determinate variations in animals"
not continuing to grow indefinitely at the apex; "determinate growth"
used of values and principles; not subject to change; steady; "undeviating loyalty"
going directly ahead from one point to another without veering or turning aside; "some people see evolution as an undeviating upward march from simple organisms to the very complex"; "a straight and narrow tree-lined road unswerving across the lowlands"