Undeviating

Adjective

 * 1) that does not deviate, veer or turn aside; unswerving
 * 2) that does not change; steady

Thesaurus
accordant, alike, arrowlike, automatic, balanced, changeless, close, consistent, consonant, constant, continuous, correspondent, dead straight, delicate, direct, equable, equal, even, exact, express, faithful, fine, flat, homogeneous, horizontal, immediate, immutable, in a line, incommutable, inconvertible, indefeasible, inerrable, inerrant, inert, infallible, insusceptible of change, intransmutable, invariable, irretrievable, irreversible, irrevocable, lasting, level, lineal, linear, mathematical, measured, mechanical, methodic, micrometrically precise, microscopic, monolithic, nice, noble, nonreturnable, nonreversible, of a piece, one-way, ordered, orderly, permanent, persistent, pinpoint, precise, rectilineal, rectilinear, refined, regular, religious, religiously exact, reverseless, right, rigid, rigorous, robotlike, ruler-straight, scientific, scientifically exact, severe, smooth, square, stable, steadfast, steady, straight, straight-cut, straight-front, straight-side, straightaway, straightforward, straightway, streamlined, strict, subtle, systematic, true, unalterable, unalterative, unaltered, unbending, unbent, unbowed, unbroken, unchangeable, unchanged, unchanging, uncurved, undeflectable, undeflected, undifferentiated, undistorted, undiversified, unerring, unidirectional, uniform, uninterrupted, unmodifiable, unremitting, unrestorable, unreturnable, unruffled, unsusceptible, unswerving, unturned, unvariable, unvaried, unvarying, upright, vertical