This is the 13134th most frequent German word.
angenehmer
"More pleasant" or "more agreeable."
In this sentence, 'angenehmer' is used as a comparative adjective, describing the improved quality (pleasantness) of the weather compared to the previous day.
Das Wetter heute ist viel angenehmer als gestern.
The weather today is much more pleasant than yesterday.
Here, 'angenehmer' is an attributive adjective, directly modifying the noun 'Spaziergang' (walk) indicating a quality of the walk itself.
Ein angenehmer Spaziergang hilft oft, den Kopf freizubekommen.
A pleasant walk often helps to clear the mind.
In this example, 'angenehmer' is again an attributive adjective, describing the quality (pleasantness) of the 'Tee' (tea).