הוראות הכביסה לא מתאימות לעור.

In Hebrew, the present tense usually does not use a separate verb for to be.

So instead of saying something literally like The washing instructions are not suitable for the skin, Hebrew says:

הוראות הכביסה לא מתאימות לעור

with no spoken or written equivalent of are.

This is very normal in present-tense Hebrew.
In past or future, Hebrew would use forms of להיות.

Because it agrees with הוראות, which is a feminine plural noun.

• singular: הוראה = instruction
• plural: הוראות = instructions

Since the subject is feminine plural, the adjective/predicate also has to be feminine plural:

• masculine singular: מתאים
• feminine singular: מתאימה
• masculine plural: מתאימים
• feminine plural: מתאימות

So הוראות ... מתאימות is correct agreement.

It is a construct chain (called סמיכות in Hebrew).

Literally, it is something like:

• instructions of the washing/laundry

But in natural English, this becomes something like washing instructions.

This structure is very common in Hebrew. Instead of using of or של, Hebrew often puts two nouns together, where the first noun belongs to or is defined by the second.

So:

• הוראות הכביסה = the washing instructions

Because in a construct chain, the first noun usually does not take the definite article directly.

So even though the whole phrase is definite, only the second noun shows it:

• הוראות הכביסה

not usually:

• ההוראות הכביסה

The definiteness of the whole phrase comes from הכביסה.
Since הכביסה is definite, the whole expression הוראות הכביסה is definite.

This is a very common Hebrew pattern.

Grammatically, Hebrew can use של in many situations, but here הוראות הכביסה is the much more natural expression.

Using של here would sound less idiomatic, because this is exactly the kind of noun combination Hebrew normally expresses with a construct chain.

So for a phrase like washing instructions, Hebrew strongly prefers:

• הוראות הכביסה
• or in a more general sense, הוראות כביסה

rather than a של phrase.

לא means not.

It negates the predicate:

• מתאימות = suitable / appropriate / compatible
• לא מתאימות = not suitable / not appropriate / not compatible

In a sentence like this, לא comes right before the adjective or participle it negates.

So:

• הוראות הכביסה לא מתאימות לעור
• literally: The washing instructions not suitable for skin/the skin

That is the normal Hebrew word order here.

The prefix ל־ here means for.

The adjective מתאים / מתאימה / מתאימים / מתאימות commonly goes with ל־ to express what something is suitable or appropriate for.

So:

• מתאים לעור = suitable for skin
• לא מתאימות לעור = not suitable for skin

This is just the normal preposition used with this word.

In unpointed Hebrew writing, לעור can be ambiguous.

It may represent:

• לְעוֹר = for skin
• לָעוֹר = for the skin

Because modern Hebrew is usually written without vowel marks, both look the same: לעור.

So you usually understand the exact meaning from context.

It can mean either one, depending on context.

• עור = skin
• עור = leather

That is very common in Hebrew. The same word can cover both meanings, and context tells you which one is intended.

So if a learner sees עור, it is reasonable to pause and ask which sense is meant.

A rough pronunciation guide:

• הוראות = ho-ra-OT
• הכביסה = ha-kvi-SA
• לא = lo
• מתאימות = mat-i-MOT
• לעור = le-OR or la-OR, depending on the intended vowels

Two pronunciation notes that often help learners:

1. הוראות has a break before the last syllable because of the א sound pattern:
   ho-ra-ot, not one smooth syllable at the end.

2. מתאימות also has that slight break:
   mat-i-mot, from the root related to תאם.

If the subject were singular feminine, the adjective would also become singular feminine:

• הוראת הכביסה לא מתאימה לעור

That means something like The washing instruction is not suitable for skin/the skin.

The important change is:

• הוראות → הוראת
• מתאימות → מתאימה

This shows again how Hebrew keeps gender and number agreement very consistently.