
munter
alert
Awake, lively, and in a good mood; the opposite of tired.
Nach einer Tasse Kaffee fühlte er sich sofort viel munterer.
After a cup of coffee, he immediately felt much more alert.
lively / alert
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alert
Awake, lively, and in a good mood; the opposite of tired.
Nach einer Tasse Kaffee fühlte er sich sofort viel munterer.
After a cup of coffee, he immediately felt much more alert.

cheerful
Cheerful, carefree, and full of energy. Can describe a person, a melody, or an activity.
Die Kinder spielten munter im Garten.
The children played cheerfully in the garden.

cheerfully on
Used as an adverb to express that an action continues uninterrupted and carefree.
Obwohl es schon spät war, plauderten die beiden munter weiter.
Although it was already late, the two kept chatting cheerfully.
The adjective 'munter' (lively/alert) is the basis for the verb 'aufmuntern' (to cheer up). To cheer someone up means to make them happy and energetic again, in other words to make them 'munter' (lively/alert) again.
Mit einem Witz versuchte sie, ihre traurige Freundin aufzumuntern.
With a joke, she tried to cheer up her sad friend.
In the meaning of 'wach' (awake), 'munter' (alert) is often used in fixed combinations. Typical phrases are 'munter werden' (to wake up and feel fit) and 'jemanden munter machen' (to wake someone up, e.g., with coffee).
Ein Spaziergang an der frischen Luft macht oft schnell wieder munter.
A walk in the fresh air often quickly makes you feel alert again.
'Munter' (cheerful/lively) can describe not only people, but also things or activities that are cheerful and lively. For example, people speak of a 'muntere Melodie' (cheerful melody) or a 'munteres Gespräch' (lively conversation).
Aus der Küche hörte man munteres Geklapper von Töpfen und Pfannen.
From the kitchen you could hear the cheerful clattering of pots and pans.
As an adverb, 'munter' expresses that an action continues carefree and without interruption. It then stands directly with the verb, often in the combination 'munter weiter...' (to keep ... cheerfully).
Die Kinder spielten munter im Regen weiter.
The children kept playing cheerfully in the rain.
fresh
“Frisch” and “munter” can both describe a person who is alert and energetic. “Frisch” particularly emphasizes that someone is rested and has renewed energy, while “munter” describes their current lively state. Use “frisch” when recovery is important and “munter” when the person simply seems awake and lively.

Nach dem langen Schlaf war Anna munter und unterhielt sich beim Frühstück.
After the long sleep, Anna was alert and chatted over breakfast.
Nach dem langen Schlaf fühlte sich Anna wieder frisch und voller Energie.
After the long sleep, Anna felt fresh and full of energy again.