Was heißt »schal« auf Englisch?

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

Deutsch/Englische Beispielübersetzungen

Sie sollten ihr Bier trinken, bevor es schal wird.: Please drink the beer before it goes flat.
Welche schalen Kommentare bekomme ich wohl zu diesem Satz?: What kind of vapid comments will I get on this sentence?
Wie ekel, schal und flach und unersprießlich scheint mir das ganze Treiben dieser Welt!: How weary, stale, flat, and unprofitable seem to me all the uses of this world.

abgeschmackt:: corny; outrageous; vulgar
banal:: banal; commonplace; trite
beliebig:: arbitrary
billig:: fitting
blass:: pale; pallid
dröge:: dry
eintönig:: monotonous
fade:: flavorless
farblos:: colorless; colourless
flau:: weak
geistlos:: dull; inane; stupid
grau:: gray; grey; grǣg
hohl:: hollow
kontrastarm:: low-contrast
langatmig:: long-winded
langweilig:: boring; dull
lasch:: lackadaisical; limp
lau:: lukewarm; mild; tepid
leer:: empty
monoton:: monotonous
muffig:: mouldy
nichtssagend:: anodyne; empty; meaningless; nondescript; platitudinous; vacuous; vague
oberflächlich:: glib; superficial
öde:: abandoned; deserted; empty
platt:: flat
schnöde:: base; contemptuous; disdainful; vile
seicht:: fordable; shallow; shoal; wadeable
trist:: dismall; sad
trivial:: trivial
trocken:: dry
trostlos:: depressing; hopeless
wohlfeil:: inexpensive

That bread has started to go stale.
The little girls were afforded a stretch limousine for their insipid, saccharine songs.
What do you prefer: cold coffee or stale beer?
The bread is stale.
These pretzels are stale.
Fresh tea is better than stale tea.
The air in the hall was stale.
The concise word is better than a long, insipid speech.
Water tastes insipid after it has been boiled.
Having spent a sleepless night, I went in search of something warm. A cup of tea would've been just the job, but there was nothing but a box of stale rolls.