Arduous is an adjective.
adverb
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Here are some examples: "It was a long and arduous journey." "It was not too arduous a task for a Sunday morning." "The mountain climbers tackled the arduous terrain."
part of speech
The part of speech for this particular word is a noun.
The word arduous is an adjective. Her journey was long and arduous, but it ultimately strengthened her character and made her a better person.
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adverb
the part of speech sashay is a averb
Did is a verb, and not is an adverb. Didn't is not any part of speech. It's a contraction of did and not.
The word speech is a noun.
Adjective
No, but it's part of a noun which the noun is the part of speech.