Bármennyire is óvatosan megyünk, visszafordulunk, ha csúszós az ösvény.

Bármennyire is means something like no matter how or however much.

It is built from:

• bár- = a prefix often used in words meaning any-, whoever, whatever, no matter
• mennyi = how much / how many
• -re = a case ending here forming an adverbial meaning
• is = an emphasizing particle

So bármennyire is óvatosan means no matter how carefully.

This structure is very common in Hungarian:

• Bárki is jön... = Whoever comes...
• Bárhol is van... = Wherever it is...
• Bármilyen is... = No matter what kind...

In your sentence, it introduces a kind of concession: even if we are very careful, we still turn back if the path is slippery.

Here is is not best translated as also / too, even though that is one of its common meanings.

In structures like bármennyire is, is adds emphasis and helps create the sense of no matter how, even however, or regardless of how.

So:

• bármennyire already points toward however much / no matter how much
• bármennyire is sounds more complete and natural in this concessive pattern

You will see the same thing in many similar phrases:

• Bármit is mondasz... = Whatever you say...
• Bárhol is lakik... = Wherever he/she lives...
• Bárki is legyen az... = Whoever that may be...

So yes, it is the same word is, but here its function is different from simple too / also.

Because óvatosan is the adverb, meaning carefully, while óvatos is the adjective, meaning careful.

Compare:

• óvatos ember = a careful person
• óvatosan megyünk = we go carefully

Hungarian often forms adverbs with -an / -en:

• gyors = fast → gyorsan = quickly
• lassú = slow → lassan = slowly
• óvatos = careful → óvatosan = carefully

Since the sentence describes how we go, Hungarian uses the adverb óvatosan.

Hungarian often uses the present tense for future meaning when the context makes the future clear.

So megyünk literally means we go / we are going, but in context it can also mean we go / travel / proceed in a general or future sense.

Likewise:

• visszafordulunk can mean we turn back or we will turn back
• ha csúszós az ösvény gives the condition, so the whole sentence can naturally be understood as a general rule or future plan

This is very normal in Hungarian. English often uses present tense too in similar conditional sentences:

• If the path is slippery, we turn back.
• If the path is slippery, we’ll turn back.

Hungarian simply does this very naturally without needing a separate future form here.

Because both verbs are in the first person plural.

• megyünk = we go / we are going
• visszafordulunk = we turn back

The ending -unk / -ünk is a common first person plural ending in Hungarian.

Examples:

• megyek = I go
• mész = you go
• megy = he/she goes
• megyünk = we go

And:

• fordulok = I turn
• fordulunk = we turn

With the prefix vissza-, visszafordulunk means we turn back.

So the sentence is talking about what we do as a group.

It means we turn back, we go back, or we turn around and return.

It is made up of:

• vissza = back
• fordul = turn
• -unk = we

So it is more than just physically rotating your body. In this context, it means we stop continuing forward and go back the way we came.

That is why turn back is usually the best English equivalent here.

A related verb is megfordulunk, which often means we turn around in a more literal sense. But visszafordulunk clearly includes the idea of returning.

Yes, Hungarian word order is flexible, but the current order is natural and meaningful.

The sentence is:

Bármennyire is óvatosan megyünk, visszafordulunk, ha csúszós az ösvény.

A natural breakdown is:

• Bármennyire is óvatosan megyünk = concessive part: no matter how carefully we go
• visszafordulunk = main action: we turn back
• ha csúszós az ösvény = condition: if the path is slippery

Hungarian often places the most important new information just before the verb, but with complex clauses like this, entire subordinate clauses can come first or last.

You could change the order for different emphasis, for example:

• Ha csúszós az ösvény, visszafordulunk, bármennyire is óvatosan megyünk.

This is still understandable, but the original sounds smoother and more natural because it first says even if we are careful, then gives the decision rule we turn back if the path is slippery.

Both are possible, but they are not exactly identical in emphasis.

• Az ösvény csúszós = The path is slippery
• Csúszós az ösvény = The path is slippery, but with focus on slippery

In Hungarian, word order often reflects emphasis or information structure.

Here, csúszós comes first because it is the important descriptive information in the ha clause:

• if it is slippery, the path...
• more naturally: if the path is slippery

So the clause highlights the condition itself: slipperiness.

This kind of predicate-first order is very common in Hungarian.

Because ösvény means path / trail, and here it refers to a specific path already known from the situation.

• egy ösvény = a path
• az ösvény = the path

Hungarian uses definite and indefinite articles much like English:

• egy = a / an
• a / az = the

The form az is used before vowels. Since ösvény begins with a vowel sound, Hungarian uses az:

• az ösvény
• compare: a ház = the house

So az ösvény simply means the path.

It can be understood as either, depending on context, but it most naturally sounds like a general rule or policy:

No matter how carefully we go, we turn back if the path is slippery.

That sounds like a principle: if the condition is met, that is what we do.

Hungarian present tense is often used for this kind of general statement. But in the right context, it could also refer to a specific future outing:

• If the path is slippery, we’ll turn back.

So the grammar allows both, and context decides.

Yes, but the meaning or tone would change.

For example:

• Nagyon óvatosan megyünk... = We go very carefully...
• Hiába megyünk óvatosan... = Even though we go carefully / It’s no use going carefully...
• Bármilyen óvatosan megyünk... = also possible in some contexts, meaning however carefully we go

But bármennyire is óvatosan has a strong no matter how careful sense. It emphasizes that the carefulness does not change the outcome.

So it is a good choice if the speaker means: Even the greatest possible care is not enough; if the path is slippery, we still turn back.