هاي محاولة جديدة.

هاي means this.

In Levantine, هاي is a common feminine singular demonstrative, so it matches محاولة, which is a feminine noun.

So:

• هاي محاولة جديدة = This is a new attempt

A masculine noun would usually take a different form, such as هاد, هيدا, or هادا, depending on the region.

In Arabic, especially in the present tense, sentences like this usually do not use a separate word for is.

So Arabic says, literally:

• هاي محاولة جديدة
• this / attempt / new

But the natural English meaning is:

• This is a new attempt

This is very normal in both colloquial Arabic and Standard Arabic.
If you wanted past or future, then forms of كان would come in.

Because in Arabic, adjectives normally come after the noun.

So:

• محاولة جديدة = literally attempt new
• natural English: a new attempt

This is one of the basic word-order differences between English and Arabic.

Because adjectives agree with the nouns they describe.

Since محاولة is feminine singular, the adjective also has to be feminine singular:

• محاولة جديدة = a new attempt

If the noun were masculine, you would use جديد instead.

So the sentence shows normal gender agreement between noun and adjective.

Yes, محاولة is feminine.

One very common clue is the ending ـة. In Arabic, nouns ending in ـة are very often feminine.

So here:

• محاولة = feminine
• therefore جديدة must also be feminine

This does not mean every feminine noun has to end in ـة, but it is a very strong pattern and very useful for learners.

A common Levantine-style pronunciation would be something like:

• hay mḥāwle jdīde

A few useful notes:

• هاي sounds like hay
• محاولة is often reduced in speech, so you may hear something close to mḥāwle
• جديدة is commonly pronounced jdīde
• the final ـة in Levantine is often pronounced like -e

Also, ح in محاولة is not the ordinary English h. It is a deeper, stronger Arabic sound.

Because the phrase is indefinite:

• محاولة جديدة = a new attempt

If you added ال, it would become definite:

• المحاولة الجديدة = the new attempt

So the original sentence means:

• This is a new attempt

not:

• This is the new attempt

That is a very useful distinction.

In هاي محاولة جديدة, the noun phrase محاولة جديدة is indefinite, so the whole sentence means:

• This is a new attempt

If you want this new attempt as one definite noun phrase, Levantine often uses:

• هالمحاولة الجديدة

You may also hear forms like:

• هاي المحاولة الجديدة

depending on context and dialect.

So:

• هاي محاولة جديدة = This is a new attempt
• هالمحاولة الجديدة = this new attempt

Because this is colloquial Levantine, not fully inflected Standard Arabic.

In Levantine speech, learners normally do not pronounce case endings such as:

• -un
• -an
• -in

and they also do not use tanween the way Standard Arabic does.

So instead of something like a fully inflected Standard Arabic pronunciation, Levantine simply says:

• هاي محاولة جديدة

The indefiniteness is understood from the fact that there is no ال.

Yes. Different Levantine varieties use different demonstrative forms.

For feminine singular this, you may hear things like:

• هاي
• هيدي

Both are Levantine-type forms, but what sounds most natural depends on the country, city, and speaker.

So if you hear:

• هيدي محاولة جديدة

it means the same thing.

In Standard Arabic, you would normally say:

• هذه محاولة جديدة

The structure is the same:

• هذه = this
• محاولة = attempt
• جديدة = new

So the main difference is that هاي is the Levantine colloquial form, while هذه is the Standard Arabic form.