Gândul este ciudat.

Because -ul is the Romanian definite article, attached to the end of the noun.

• gând = a thought
• gândul = the thought

So Gândul este ciudat literally means The thought is strange.

This is a major difference from English: Romanian usually puts the at the end of the noun instead of using a separate word.

Este means is.

So:

• Gândul = the thought
• este = is
• ciudat = strange

Together: The thought is strange.

In standard Romanian, este is normally included here. In everyday speech, many speakers use e instead:

• Gândul este ciudat. — more formal or neutral
• Gândul e ciudat. — very common in speech

You generally would not leave it out entirely in this sentence.

In this sentence, ciudat is not directly attached to the noun inside a noun phrase. It comes after este, so it is a predicate adjective:

• The thought is strange

That is normal in both English and Romanian.

If you want to say the strange thought, then Romanian usually places the adjective after the noun:

• gândul ciudat = the strange thought

So:

• Gândul este ciudat = The thought is strange
• gândul ciudat = the strange thought

Gând is a neuter noun in Romanian.

Romanian neuter nouns behave:

• like masculine in the singular
• like feminine in the plural

In this sentence, the noun is singular, so it behaves like a masculine noun. That is why the adjective is:

• ciudat for masculine/neuter singular

If the noun were feminine singular, the adjective would usually look different.

Because ciudat agrees with gândul, which is singular neuter and behaves like masculine in the singular.

Compare:

• gândul este ciudat = the thought is strange
• ideea este ciudată = the idea is strange

So the adjective changes depending on the gender and number of the noun.

A simple learner-friendly pronunciation is:

• gândul ≈ GUN-dool
• este ≈ YES-teh
• ciudat ≈ choo-DAHT

A few useful notes:

• â is a Romanian vowel that does not exist in English. It is a central sound, somewhat like the vowel in a very reduced roses or sofa, but tighter and more central.
• ciu- in ciudat sounds roughly like choo.
• Stress is usually:
  • GÂN-dul
  • ES-te
  • ciu-DAT

An approximate whole-sentence pronunciation: GUN-dool YES-teh choo-DAHT

They both mean is.

• este = full form
• e = shorter form, very common in everyday speech

So both are correct:

• Gândul este ciudat.
• Gândul e ciudat.

In writing, este can sound slightly more formal or careful, while e sounds more natural and conversational.

Yes, but Gândul este ciudat is the most neutral order.

Romanian word order is somewhat flexible, especially for emphasis. For example:

• Ciudat este gândul. — marked or literary; emphasizes strange
• Este ciudat gândul. — possible in some contexts, but less neutral

For a learner, the normal pattern to use is:

• subject + este/e + adjective
• Gândul este ciudat.

No, not with gândul.

Because gândul is definite, it means the thought.

If you wanted a thought, you would usually say just:

• Un gând = a thought

So:

• Gândul este ciudat. = The thought is strange.
• Un gând este ciudat. = A thought is strange.

Not always. Ciudat often means:

• strange
• odd
• weird

Depending on context, English strange could sometimes be translated with other words in Romanian, but ciudat is a very common and natural choice.

So in this sentence, ciudat is a straightforward, useful word to learn.

Because Romanian usually expresses definiteness with an enclitic definite article—in other words, the article is attached to the end of the noun.

Examples:

• băiat = boy

• băiatul = the boy

• gând = thought
• gândul = the thought

This is one of the first big grammar differences English speakers notice in Romanian.

It is in the nominative case, because it is the subject of the sentence.

• Gândul = the subject
• este = is
• ciudat = subject complement / predicate adjective

For a beginner, the important point is simply that this is the basic dictionary-style sentence pattern: The thought is strange.

Yes. That means:

• Acest gând este ciudat. = This thought is strange.

Notice something important:

• gândul already means the thought
• acest gând means this thought

When you use acest, you normally use the noun without the suffixed definite article:

• acest gând, not acest gândul

So both are correct, but they mean slightly different things:

• Gândul este ciudat. = The thought is strange.
• Acest gând este ciudat. = This thought is strange.