It was smouldering hot today.
She was sent into a smouldering rage.
The word smouldering is a verb. It is the present participle of smoulder.
Here are some sentences.
The fire is still smoldering.
The smoldering cinders caught the grass on fire.
adverb
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A smouldering inferno.
Smouldering Fires was created in 1975.
The Smouldering - 1915 was released on: USA: 12 July 1915
The Smouldering Spark - 1914 was released on: USA: 29 April 1914
Smouldering Tires - 1926 was released on: USA: 25 April 1926
'Smouldering temper' means being very angry but not showing it and mentally steaming a bit like a fire that has gone out. You will have a smouldering temper when someone says something that is embarrassingly wrong and knowing that you cannot retaliate.
part of speech
The part of speech for this particular word is a noun.
adverb
what part of speech is work
what part of speech is beneath
The cast of Smouldering Fires - 1915 includes: Elsie Cort as Inez Wilfred Lucas George Periolat