हालाँकि शब्दकोश उधार है, फिर भी मैं उसे आरक्षित करूँगी।

Yes, हालाँकि already means although / even though, but Hindi very often uses a paired structure:

हालाँकि ... फिर भी ...
= although ... still / nevertheless ...

So the sentence literally feels like:

Although the dictionary is on loan, still I will reserve it.

In English, using both can sound a bit heavy, but in Hindi it is very normal and natural.
You can think of फिर भी as adding emphasis: even so, nevertheless, all the same.

उधार means borrowed, on loan, or lent out, depending on context.

So शब्दकोश उधार है means something like:

• The dictionary is borrowed
• The dictionary is on loan
• The dictionary has been lent out

In this sentence, the most natural understanding is that the dictionary is currently not freely available because someone has borrowed it.

Because उसे is the oblique/object form of वह.

• वह = he / she / it / that as a subject
• उसे = him / her / it / to him / to her / to it, depending on context

Here, the dictionary is the object of आरक्षित करूँगी (will reserve), so Hindi uses उसे.

Compare:

• वह शब्दकोश है। = That is the dictionary.
• मैं उसे आरक्षित करूँगी। = I will reserve it.

Yes. Hindi does not have a separate everyday pronoun for it the way English does.

So वह / उसे / उसका can refer to:

• a man
• a woman
• an animal
• a thing

Context tells you which one is meant.

In this sentence, since the earlier noun is शब्दकोश (dictionary), उसे clearly means it.

Because the speaker is feminine.

In first person future tense, Hindi shows the gender of the speaker:

• मैं ... करूँगा = I will do ... (male speaker)
• मैं ... करूँगी = I will do ... (female speaker)

So:

• मैं उसे आरक्षित करूँगी। = said by a woman
• मैं उसे आरक्षित करूँगा। = said by a man

This is a very common Hindi pattern: a noun/adjective-like word plus करना.

Here:

• आरक्षित = reserved
• करना = to do / to make

Together, आरक्षित करना means to reserve.

Hindi often forms verbs this way, especially in formal vocabulary. Similar examples:

• प्रयोग करना = to use
• निर्णय करना = to decide
• साफ़ करना = to clean

So आरक्षित करूँगी literally feels like will make reserved, but naturally it means will reserve.

It is understandable, but it sounds fairly formal or bookish.

In everyday speech, many speakers would more likely say:

• रिज़र्व करूँगी
• बुक करूँगी
• or rephrase the whole sentence depending on the situation

So this sentence is grammatically fine, but its vocabulary is a bit formal because of words like शब्दकोश and आरक्षित.

Because Hindi does not have articles like a, an, and the.

So शब्दकोश can mean:

• a dictionary
• the dictionary

The exact meaning comes from context.

In this sentence, English would probably use the dictionary, but Hindi simply says शब्दकोश.

शब्दकोश is masculine.

That matters for agreement in some contexts, though in this sentence you do not see much visible agreement with it. If you used an adjective that changes form, you would see masculine agreement.

For example:

• यह बड़ा शब्दकोश है। = This is a big dictionary.

Here बड़ा shows masculine singular agreement.

Because शब्दकोश is singular.

• है = is
• हैं = are

So:

• शब्दकोश उधार है। = The dictionary is on loan.
• शब्दकोश उधार हैं। would be incorrect, unless you had a plural subject such as शब्दकोश in a context where it was clearly plural, which is unusual because the plural of शब्दकोश is typically understood from context or with a numeral.

If you had a clearly plural subject, you would say:

• शब्दकोश उधार हैं। = The dictionaries are on loan.

But in this sentence, it is singular.

The given order is very natural:

हालाँकि शब्दकोश उधार है, फिर भी मैं उसे आरक्षित करूँगी।

This follows the common concessive pattern:

हालाँकि + clause, फिर भी + clause

Hindi word order is somewhat flexible, but this pairing is a standard and clear way to express the idea. If you changed things around too much, it might sound less natural or lose the clear although ... nevertheless ... structure.

Sometimes, but it changes the feel.

• फिर भी = even so / nevertheless / still
• लेकिन = but

With हालाँकि, फिर भी is the more natural partner because both together express concession very clearly.

So:

हालाँकि शब्दकोश उधार है, फिर भी मैं उसे आरक्षित करूँगी।
sounds stronger and more idiomatic than:

हालाँकि शब्दकोश उधार है, लेकिन मैं उसे आरक्षित करूँगी।

The second version is understandable, but the first is better.

The comma is helpful, but not absolutely essential.

It marks the pause between the two clauses:

• हालाँकि शब्दकोश उधार है
• फिर भी मैं उसे आरक्षित करूँगी

In written Hindi, punctuation is often lighter or less rigid than in English, but using a comma here makes the sentence easier to read.

It has two clauses:

1. हालाँकि शब्दकोश उधार है
   = Although the dictionary is on loan

2. फिर भी मैं उसे आरक्षित करूँगी
   = nevertheless I will reserve it

So the basic pattern is:

हालाँकि + situation, फिर भी + contrary action/result

This is a very useful Hindi structure for expressing concession:

• हालाँकि बारिश हो रही है, फिर भी हम जाएँगे।
  = Although it is raining, we will still go.

• हालाँकि वह थकी है, फिर भी काम कर रही है।
  = Although she is tired, she is still working.