An adverb is a word that modifies a verb. 'Hard' is not a verb, therefore it can't have an adverb tacked onto it. If you wanted to remove 'hard' from the sentence and make a new one that includes an adverb, and has basically the same meaning, you could do something like this: "The carpenters strenuously worked all day without food or water."
worked
The colours in the painting were vivid. I had a vivid dream last night vivid vivid vivid
No, it is not. It is the adverb form of the adjective vivid (bright, clear).
I have many vivid dreams at night, but not so vivid during the day.
After the sun rose, the sky became a vivid shade of blue.
the colors were so vivid . The photo was very vivid .
i have no idea, LOL
Laboured, sweated, slaved are some examples.
I had a really vivid dream last night and woke up with a woodie.
Some things in their natural state are the most vivid colours.
She gave us a vivid description of her trip.
Both...It was a Vivid dream.Vivid modifies dream, and adverbs cannot modify nouns, so it is and adjective.He mocked vividly with remarks.Here, vividly modifies the verb, mocked, so it is an adverb since adverbs modify verbs, adjecives, or other adverbs, and adjectives modify only nouns/pronouns.