Yes it can be used at the end of a sentence, however, its a word which can be at the beginning, middle or end.
E.g.
Loudly, he ran away.
She screamed loudly because she was scared.
He heard someone screaming loudly.
Sure, here is a sentence using "loudly" at the end: The music played loudly in the room.
The man shouted loudly down the hall, disturbing most of the employees.
the participle phrase in this sentence is "sighing loudly."
The adverb in the sentence is "loudly." It describes how their mother called for them to come home.
The adverb form of the adjective "loud" is "loudly."
The participial form of the sentence is "sighing loudly, Kristen accepted her punishment."
An imperative sentence.Shout loudly!
The man shouted loudly down the hall, disturbing most of the employees.
The fans cheered loudly when the performers took their final bows.
She cried or bawled loudly.
"He chortled loudly at his own joke".
Birds squawk too loudly.
There is no adjective in the sentence "The lion growled loudly." Loudly is an adverb modifying the verb growled.
The delirium boy screamed loudly inside the store.
Verb: Penelope crunches her cereal loudly.
The minister smiled as he loudly proclaimed the marriage of the happy couple.
A dog howled loudly all night is a sentence.
The first way you could use cursed in a sentence is "he was forever cursed to a life of pain". If you wish to use it as a swearing type curse a sentence you could use is " he cursed loudly at John"