I've heard many people say "big black eyes," and I'm curious whether or not we must put an and in-between big and black.
To me, since big and black are describing eyes, it is necessary to put an and between the two. Is it just a careless mistake?
I've heard many people say "big black eyes," and I'm curious whether or not we must put an and in-between big and black.
To me, since big and black are describing eyes, it is necessary to put an and between the two. Is it just a careless mistake?
The "and" is not wrong, but it is much less common than commas, except when the adjectives all come from a fixed expression like "salt-and-pepper hair" or "a fat, dumb, and happy audience".
Other than that, it's mostly used for euphony:
I will not cease from mental fight,
Nor shall my sword sleep in my hand,
Till we have built Jerusalem
In England's green and pleasant land.
-- William Blake
Blake certainly could have written "green, pleasant land", but it would have sounded too prosaic. Compare:
Go to the banks of the great grey-green, greasy Limpopo River, all set about with fever-trees, and find out.
-- Rudyard Kipling
Note the lack of a comma after "great"; since it cannot go anywhere else in the list, it is considered not part of the list at all and no comma. Since "grey" and "green" are acting in combination, they are hyphenated. The proper name Limpopo is technically an adjective, but by the previous rule, still no comma.
If you are repeating an adjective for emphasis, never use "and":
It is a far, far better thing that I do, than I have ever done; it is a far, far better rest that I go to than I have ever known.
-- Dickens
"Far and far better thing" would be very, very wrong.
Medica uses the example large white Italian silk pill-box to illustrate what she calls "families". (I assume she means a pill-box that is silk and is Italian; if the box were made of or for Italian silk, you should write "Italian-silk box".)
You can write "a large and white box", although I doubt a native speaker would, but writing "a large and Italian box" is wrong. The degree of difference between the words needed for this rule to kick in is vague: "large and Italian", wrong; "large and heavy", no problem (large and heavy both describe physical attributes); "large and white", eh a little unidiomatic.
What [punishment] will you get? Uh, a ... large and painful hickey.
-- Woody Allen
The mention of nationalities reminds me. If two adjectives describe different members of a collective noun, you use "and", so you write "a German and Irish crowd" if the people in the crowd came from those two countries.
By contrast, if two adjectives describe different parts of a single object, you use "and" with hyphens. So, "a black-and-white photograph", "a ham-and-eggs breakfast", "stop-and-go traffic".
Putting these last two rules together, we see "a German and Irish family" would feature members from Germany and Ireland, but in a "a German-Irish family", every member of the family would have ancestors from there.
The 'and' can be substituted for a comma. For example 'big, black eyes'. It follows the rule for writing lists separated by commas where the last item has an 'and'. For example "I need bread, milk, butter and eggs". Overall 'big and black eyes' sounds unwieldy but isn't strictly wrong.
The actual answer to your question is, no, you do not have to put in the and.
All three possibilities are common: ands, commas, or nothing at all.
You can see any number of commonplace examples of all three.
As many mentioned, this is a many-times duplicated question, so just search around.