This is the 1070th most frequent Dutch word.
constant
Unchanging; continuous; consistent.
Here, 'constant' is used as an adjective to mean 'unchanging' or 'steady,' describing the condition of the temperature.
De temperatuur in deze kamer blijft constant.
The temperature in this room remains constant.
In this context, 'constant' is used as an adverb, modifying the verb 'improving' to mean 'continuously' or 'without pause.'
Hij is constant zijn werk aan het verbeteren.
He is constantly improving his work.
Here, 'constant' functions as an adjective to describe the quality of the speed as 'unchanging' or 'uniform.'