Parecchio, molto
No, papà è che c'ho parecchio lavoro da fare, sono un po' sotto pressione.
No, Dad, it's that I have quite a lot of work to do; I'm under a bit of pressure.
Caption 17, Il Commissario Manara - S1EP11 - Beato tra le donne - Part 7
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Parecchio might be less familiar to you than molto.
Ho molto lavoro (I have a lot of work).
Like molto, parecchio is used as an adjective and in this case has different endings depending on whether it modifies a masculine or feminine noun and depending on whether it’s plural or singular.
Il lavoro is masculine, so it’s parecchio lavoro or molto lavoro.
Ci sono parecchie cose strane.
There are a lot of strange things.
Caption 72, Il Commissario Manara - S1EP1 - Un delitto perfetto - Part 7
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La cosa is feminine and it’s plural, so we say parecchie cose or molte cose.
But like molto, parecchio is also an adverb. In the following example, parecchio could easily replace molto.
Mi piace molto il posto e poi ho ritrovato vecchi amici e la zia è deliziosa come sempre.
I like the place a lot and then I met up with old friends and Aunt is charming as always.
Captions 13-14, Il Commissario Manara - S1EP11 - Beato tra le donne - Part 7
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Un sacco
Un sacco is quite colloquial, as is “bunch!” Sacco translates as “bag,” or “sack, so imagine a big bag of something!
Non fare questa faccia, vedrai che ti farai un sacco di amici.
Don't make that face. You'll see that you'll make a bunch of friends.
Caption 10, La Tempesta - film - Part 9
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Tanto
Tanto is another word for a lot. Like the other words above, it can be used as an adjective:
E... insomma, dopo un tempo che in quel momento non sapevo stimare se era tanto o poco
And... in short, after a time, which in that moment I couldn't assess whether it was a lot or a little
Captions 54-55, Anna presenta - Il mio parto
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Certo che firmo per la barella, non avevo tanta scelta.
Of course I'll sign for a gurney. I didn't have much choice.
Caption 33, Anna presenta - Il mio parto
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Tanto can be used as an adverb as well.
Non andavo tanto veloce, ma mi hanno fatto la multa.
I wasn’t going very fast, but they gave me a ticket.
It’s always good to know several different ways to say something. Variety is the spice of life!