Was heißt »konstant« auf Englisch?

Das Adjektiv konstant lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Deutsch/Englische Beispielübersetzungen

Eine Zufallsvariable ist genau dann fast sicher konstant, wenn ihre Varianz Null ist.: A random variable is definitely a constant if the variance is zero.
Die Handelsbilanz des Landes verbesserte sich letztes Jahr, da bei konstantem Import der Export zulegte.: The nation's trade balance improved last year as exports were strong, while imports remained steady.
Während des gesamten Monats hatten wir relativ konstante Temperaturen.: The temperatures we had throughout the month were relatively unchanged.
Auf dieser Straße herrscht ein konstanter Verkehrsfluss.: There is a constant flow of traffic on this road.
Die Einwohnerzahl dieser Stadt ist in den letzten zehn Jahren konstant geblieben.: The population of this town has been static for the last ten years.
Das zweite newtonsche Gesetz besagt: „Kraft ist gleich der Veränderung des Impulses geteilt durch die Veränderung in der Zeit. Bei konstanter Masse ist die Kraft gleich Masse mal Beschleunigung.“: Newton's Second Law says: "Force is equal to the change in momentum per change in time. For a constant mass, force equals mass times acceleration".
Die Funktion f(x) = π² ist eine konstante Funktion.: The function f(x) = π² is a constant function.
In Tiefen zwischen 1 km und 4 km bleibt die Wassertemperatur konstant.: Below 3,300 feet to a depth of about 13,100 feet, water temperature remains constant.

alleweil:: always
allzeit:: always
ausdauernd:: persevering; persistant; stamina; tenacious
beharrlich:: persistent
fest:: solid
fortwährend:: continual
gleichbleibend:: steady
hartnäckig:: adamantine; besetting; bulldog; confirmed; do-or-die; dogged; doggedly; insistent; intractable; obstinate; obstinately; persevering; persistent; pertinacious; pertinaciously; refractory; stiff-necked; strongheaded; stubborn; stubbornly; tenacious; tough
immer:: always
immer wieder:: again and again; repeatedly
inert:: inert
insistent:: insistent
invariant:: invariant
jederzeit:: anytime; at any moment; at any time
kontinuierlich:: continuous
perpetuell:: perpetual
persistent:: persistent
stabil:: stable; sturdy
ständig:: persistent
standhaft:: steadfast
stetig:: continuous
stets:: always; continuously
unabänderlich:: unchangeable
unablässig:: incessant; unremitting
unbeirrt:: enduring
unermüdlich:: indefatigable; tireless
unveränderlich:: immutable; unalterable; unchangeable; unchanging
unverdrossen:: steady

Is the pain throbbing or constant?
You live here with a constant perception that something may happen at any time.
I've been trying to get hold of Tom for hours, but it's constantly engaged.
It's constantly snowing.
It snows constantly.
Languages are constantly changing.
This old car breaks down constantly.
That old car constantly breaks down.
This old car is constantly breaking down.
Tom's constant politeness bugs me.
I don't constantly regret it anymore.
The wood has warped because of the constant humidity.
Although Tom thinks himself somewhat capable of reading French texts, he makes constant mistakes in translating them.
Language is subject to constant change.
It has been raining constantly lately.
"When are you finally going to be finished here? I want the room back." "Not yet. If it's too slow for you, lend a hand, instead of constantly mooching about the place."
My car breaks down constantly.
He constantly sings her praises.
This constant pessimism won't get us anywhere.
The telephone was constantly engaged.