Мій кіт м’який і ніжний.

Because мій must agree with кіт in gender, number, and case.

• кіт is masculine
• singular
• nominative case

So the correct possessive form is мій.

Compare:

• мій кіт = my cat, masculine
• моя кішка = my cat, feminine
• моє кошеня = my kitten, neuter

They are adjectives describing кіт, so they also have to agree with it.

Since кіт is masculine singular nominative, the adjectives are also:

• м’який
• ніжний

If the noun changed, the adjectives would change too:

• моя кішка м’яка і ніжна = my cat is soft and gentle
• мої коти м’які і ніжні = my cats are soft and gentle

In Ukrainian, the present-tense verb to be is usually not said in sentences like this.

So:

• Мій кіт м’який і ніжний.

literally looks like:

• My cat soft and gentle.

But it naturally means:

• My cat is soft and gentle.

This is completely normal Ukrainian grammar.

If you talk about the past or future, then a form of to be appears:

• Мій кіт був м’який і ніжний. = My cat was soft and gentle.

They overlap a little, but they are not the same.

• м’який usually means soft in a physical sense
• ніжний usually means gentle, tender, affectionate, delicate

So in this sentence:

• м’який = soft to the touch
• ніжний = gentle in manner or temperament

Together, they give a fuller description: the cat is both physically soft and emotionally gentle.

The apostrophe in Ukrainian is a real spelling mark, not just punctuation.

In м’який, it shows that the following я keeps its y-sound, so the beginning is pronounced roughly like mya-.

Without getting too technical:

• м’я- sounds like mya
• the apostrophe prevents the consonant from blending in the same way it would without it

It is not the same as the soft sign ь.

A rough English-friendly approximation is:

• mya-KYY

with the stress on the second syllable:

• м’яки́й

A few notes:

• м’я sounds roughly like mya
• кий does not sound exactly like English key
• the final ий is a Ukrainian ending that has no perfect English equivalent

So use mya-KYY only as a helpful approximation.

A rough pronunciation guide is:

• Мій кіт м’який і ніжний
• miy kit mya-KYY i NIZH-nyy

Stress:

• м’яки́й
• ні́жний

Word by word:

• Мій = miy
• кіт = kit
• м’який = mya-KYY
• і = ee
• ніжний = NIZH-nyy

Again, this is approximate, but it is useful for getting started.

Usually, yes: кіт is the standard word for a male cat or tomcat.

But in everyday speech, people may also use it more loosely for a pet cat in general, especially if the cat is known to be male.

Related words:

• кіт = male cat
• кішка = female cat, and often also cat in a general sense
• кошеня = kitten

So мій кіт is perfect if the pet is male.

Yes. You can say:

• Мій кіт м’який і ніжний
• Мій кіт ніжний і м’який

Both are correct.

The difference is mostly about emphasis or style:

• the first adjective often feels a little more prominent
• the meaning stays basically the same

Yes, if the context already makes it clear which cat you mean.

Ukrainian often leaves out possessive words like мій when they are obvious from context.

So:

• Кіт м’який і ніжний. = The cat is soft and gentle. / My cat is soft and gentle, if context makes that clear.
• Мій кіт м’який і ніжний. = My cat is soft and gentle, with explicit possession

Using мій can also add a little emphasis, as in my cat.

Yes. Both і and та can mean and.

• і is very common and neutral
• та is also common, often chosen for rhythm, style, or sound

So both are possible:

• Мій кіт м’який і ніжний
• Мій кіт м’який та ніжний

In this sentence, і is the most straightforward choice.

Because м’який and ніжний are joined by і in a simple two-item list.

In Ukrainian, just like in English, you normally do not put a comma before and when there are only two coordinated words:

• м’який і ніжний

A comma would be used in a longer list, depending on structure, but not here.