Look at these adverbs:
Ce fil est apparent, mais apparemment personne ne l'a remarqué.This thread is showing, but apparently no one noticed it.
When turned into adverbs, adjectives ending in -ant and -ent act as follows:
-ant becomes -amment
-ent becomes -emment
-ent becomes -emment
Pronunciation: -emment and -amment both pronounce the same = [aman]
Attention:
Note that though the adverb couramment (fluently) is based on the adjective courant, the latter never means fluent, but can mean running (water), or common (word...).
Thus in French, you cannot express the sentence I am fluent in [...], but you use I speak [...] fluently instead.
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Examples and resources
Le temps n'est pas constant: il change constamment.The weather is not constant: it changes constantly.

Ce langage est courant: des millions de personnes le parlent couramment à travers le monde.This language is common: millions of people speak it fluently around the world.