Of an object, material, or its condition: not liable to break or give way; firm; reliable; sound. Also of a colour: not liable to alter or fade…

Determined, fixed, settled; not variable or fluctuating; unfailing. To avoid ambiguity from confusion with sense A. 7, the adjective is sometimes…

Of rent, fees, income, wages, etc.: fixed over a specified period; regularly accruing. Of prices: not subject to fluctuation or alteration; set…

Of an abstract or immaterial thing: firmly established or settled; not liable to be destroyed or overthrown.

Not liable to fail or vary. Of a doctrine, theory, conclusion: Securely established, not likely to be disproved or found wanting.

Fixed, determined, definite. Obsolete.

Of a quality, power, etc.: abiding, present, inherent, established.

Settled, fixed, so as not to vary.

Of beliefs, institutions, etc.: Fixed, permanent; settled, unchanging. Of a person's gaze: Fixed, set. Now rare.

Of things: Remaining ever the same in condition, quality, state, or form; invariable, fixed, unchanging, uniform.

(un-, prefix1 affix 1b.)

Firmly established by long continuance; long-established; deep-rooted; obstinate. (Now mostly of things evil.)

Of a solid, substantial, ample, or thorough nature or character.

(un-, prefix1 affix 4.)

In immaterial sense: Firmly attached or implanted; securely established; secured against alteration or dislodgement. In early use often (now rarely)…

(un-, prefix1 affix 1b.)

? Steadfast.

That cannot be moved or changed; steady, fixed, constant; = immovable, adj. 2. Obsolete.

Rendered or become inveterate; confirmed by age or long continuance.

Unmoved, motionless; unaltered.

Not subject to or admitting of change; fixed, set, determined; (later esp. in negative sense) overly determined, inflexible; ossified.

(? Confused with stable, adj.) Permanent, stable. Obsolete.

Remaining in the same state or condition; settled, persistent; durable. Obsolete.

That cannot be rooted out; = ineradicable, adj.

That cannot be coerced, restrained, or overpowered by force; irrepressible.

Rigidly laid down or prescribed; fixed, inflexible; definitive.

(un-, prefix1 affix 1b.)

Originally: (with reference to a marching or walking step) employing or resembling the lockstep. Later also: rigid, unchanging, inflexible.

Of, relating to, or designating a fixed or stable condition, as distinguished from a state of progress or change. Also: that is in such a condition…

Of an immaterial thing: that does not change or progress; fixed, constant, invariable. Also: of, relating to, or designating a fixed or stable…

Of the nature of or relating to a flatline (sense A. 1a); static, not growing.