Final answer:
The word 'careless' is an adjective and the word 'carelessly' is an adverb.
Step-by-step explanation:
In the sentence 'Richard is careless', the word 'careless' is an adjective because it describes the noun 'Richard'.
In the sentence 'Richard talks carelessly', the word 'carelessly' is an adverb because it describes how Richard talks.
Learn more about Parts of speech: adjectives and adverbs