Iactus impar est.

Here, iactus is a noun, not a finite verb. It is a nominative singular masculine noun of the 4th declension.

A learner might notice that iactus can also be a form related to the verb iaciō (to throw), but in this sentence it is functioning as the subject of est. In other words, it is the thing being described.

Because impar is the nominative singular form.

Its dictionary entry is usually given as impar, imparis, which shows:

• impar = nominative singular
• imparis = genitive singular

So in this sentence, impar is the correct form because it matches iactus in case and number.

Both are nominative singular.

• iactus is the subject
• impar is a predicate adjective after est

After a form of esse (to be), Latin normally uses the nominative for both the subject and the word describing it.

Because impar is a third-declension adjective, not a first/second-declension adjective like bonus, bona, bonum.

Some Latin adjectives do not use -us in the masculine nominative singular. Impar is one of them. Its forms belong to the third declension, so its nominative singular is simply impar.

Latin does not have articles like English the or a/an.

So a Latin noun like iactus can mean:

• the throw
• a throw
• just throw

The exact English wording depends on the context.

Because Latin word order is much more flexible than English word order.

Putting the verb at the end is very common in Latin, especially in straightforward prose. So Iactus impar est is a very normal Latin sentence order.

Other orders could also be possible, such as:

• Iactus est impar
• Impar iactus est

The basic meaning stays the same, though the emphasis may shift slightly.

Impar is a predicate adjective. That means it describes the subject through the linking verb est.

So the structure is:

• iactus = subject
• est = is
• impar = adjective describing the subject

This is the same basic pattern as in English sentences like:

• The man is tall
• The door is open

Sometimes, yes, but usually not in simple beginner prose.

Latin can omit forms of to be in certain styles, especially in poetry, epigrams, or compressed expression. But in a basic sentence like this, est is normally included.

So Iactus impar est is the clear, standard form.

In restored Classical pronunciation, a good approximation is:

YAK-toos IM-par est

A few helpful points:

• initial I before a vowel here sounds like English y
• ct is pronounced as both consonants, as in ak-t
• impar has the stress on the first syllable

So the whole sentence sounds roughly like:

YAK-toos IM-par est

A few clues help:

• iactus is a noun
• impar is an adjective
• with est, Latin commonly has a noun as subject and an adjective as predicate

So the natural analysis is:

• iactus = the thing being talked about
• impar = the quality assigned to it

Grammatically, both are nominative, but their parts of speech make their roles clear.