
glühend
glowing
So hot that it gives off light by itself. Often used for metals, coal, or lava.
Der Schmied formte das glühende Eisen mit dem Hammer.
The blacksmith shaped the glowing iron with the hammer.
glowing
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glowing
So hot that it gives off light by itself. Often used for metals, coal, or lava.
Der Schmied formte das glühende Eisen mit dem Hammer.
The blacksmith shaped the glowing iron with the hammer.

ardent
In a figurative sense: very intense, passionate, or enthusiastic.
Sie ist eine glühende Verfechterin der Menschenrechte.
She is an ardent advocate of human rights.

scorching
Describes extreme, searing heat, usually in reference to the sun or the weather.
Wir suchten in der glühenden Mittagshitze nach Schatten.
We looked for shade in the scorching midday heat.
'Glühend' (glowing) is the present participle of the verb 'glühen' (to glow). It is used like a normal adjective and is declined before a noun.
Vorsicht, das Metall ist noch glühend!
Careful, the metal is still glowing!
The noun that 'glühend' (glowing/ardent/scorching) describes reveals the meaning. 'Glühendes Eisen' (glowing iron) means physical heat, a 'glühender Anhänger' (ardent supporter) means passion, and 'glühende Hitze' (scorching heat) refers to the weather.
Der Vulkan spuckte glühende Lava.
The volcano spewed glowing lava.
In the figurative meaning, 'glühend' (ardent) is often combined with people or feelings. Typical examples are 'ein glühender Anhänger' (an ardent supporter), 'eine glühende Verehrerin' (an ardent admirer), or 'glühender Hass' (burning hatred).
Er ist ein glühender Fan dieser Fußballmannschaft.
He is an ardent fan of this football team.
To describe extreme heat from the sun, 'glühend' (scorching) is often combined with words like 'Hitze' (heat) or 'Sonne' (sun). A typical phrase is 'in der glühenden Mittagssonne' (in the scorching midday sun).
Sie suchten Schutz vor der glühenden Nachmittagshitze.
They sought shelter from the scorching afternoon heat.
burning
Brennend and glühend can both express very strong feelings or an intense attitude. Brennend often emphasizes an urgent or agonizing desire, whereas glühend tends to convey passionate enthusiasm or admiration. „Brennend“ usually fits a need, while „glühend“ is more suitable for enthusiastic support.

Die Fans unterstützten ihre Mannschaft mit glühender Begeisterung.
The fans supported their team with fervent enthusiasm.
Nach dem langen Streit hatte sie ein brennendes Bedürfnis nach Ruhe.
After the long argument, she had a burning need for peace and quiet.