Indefinite adjectives describe nouns in a nonspecific way. They do not identify a particular person or thing, but rather indicate an indefinite amount or selection. In English, common indefinite adjectives include words like 'some', 'any', 'no', 'every', 'each', 'many', 'few', and 'several'. These words come before a noun and tell us something general about quantity or identity.

Indefinite adjectives often signal quantity or general selection without naming exact items. 'Some' and 'any' are used for unspecified amounts, 'no' denies the existence of any item, and 'every' and 'each' refer to members of a group in a general way. 'Many', 'few', and 'several' describe number without being exact.

Word/Phrase	Definition
some	Describes an unspecified amount or number of a noun.
any	Describes an unspecified amount of a noun, often in questions or negatives.
no	Denies the presence of any of the noun.
every	Refers to all members of a group in a general way.
each	Refers to individual members of a group one by one.
many	Describes a large but indefinite number.
few	Describes a small but indefinite number.
several	Describes more than two but not a large number.

Indefinite adjectives are placed directly before the noun they describe. They function like other adjectives and do not stand alone without a noun. The structure is usually 'indefinite adjective + noun', as in 'some water' or 'each student'. In English, this placement is stable across questions, statements, and negatives.

Rule
Place the indefinite adjective immediately before the noun it describes.
Do not use the indefinite adjective as a substitute for the noun.
Keep the order as 'indefinite adjective + noun' within noun phrases.

Some indefinite adjectives interact with countable and uncountable nouns differently. 'Many', 'few', and 'several' typically go with countable nouns, like 'many books' or 'few options'. 'Much' and 'little' go with uncountable nouns, like 'much time' or 'little water'. 'Some', 'any', 'no', 'each', and 'every' can be used with both, but may change meaning depending on the noun.

Word/Phrase	Definition
many	Used with countable nouns to indicate a large indefinite number.
few	Used with countable nouns to indicate a small indefinite number.
several	Used with countable nouns to indicate more than two but not many.
much	Used with uncountable nouns to indicate a large indefinite amount.
little	Used with uncountable nouns to indicate a small indefinite amount.

'Any' is commonly used in questions and negative sentences to refer to an indefinite amount. In questions, it asks about the existence or amount of something without specifying. In negatives, it means that the amount is zero or not present. 'Some' is often used in positive sentences and polite offers or requests.

Rule
Use 'any' with nouns in questions to ask about an indefinite amount.
Use 'any' with nouns in negatives to mean no amount.
Use 'some' with nouns in positive statements for an indefinite amount.
Use 'some' with nouns in offers or requests for politeness.

'Each' focuses on individual members of a group, often thinking of them one at a time. 'Every' treats the group as a whole and is used when the statement applies to all members collectively. Both are followed by a singular noun, but 'each' may appear with smaller groups or when emphasizing individuality. 'Every' is natural with regular events or large groups.

Word/Phrase	Definition
each	Focuses on individual members one by one.
every	Applies to all members of a group collectively.

Indefinite adjectives in English describe nouns without specifying exactly which or how many. They come before the noun and often signal general quantity or selection. Choosing the right word depends on whether the noun is countable or uncountable and on whether the sentence is positive, negative, or a question. Consistent placement and attention to meaning make indefinite adjectives clear and natural in use.