Ik blijf vanavond lekker thuis.

Because ik takes the first-person singular form of the verb.

The infinitive is blijven = to stay / to remain.
Its present-tense forms are:

• ik blijf
• jij blijft
• hij/zij blijft
• wij blijven
• jullie blijven
• zij blijven

So in Ik blijf vanavond lekker thuis, blijf means I stay / I’m staying.

Right. In this sentence, lekker does not mean tasty/delicious.

Dutch uses lekker very broadly. Here it means something like:

• nicely
• pleasantly
• comfortably
• cozily
• just nice and relaxed

So Ik blijf vanavond lekker thuis suggests more than just I’m staying home tonight. It has the feeling of:

• I’m staying home tonight, nice and cozy
• I’m staying home tonight and taking it easy
• I’m happily staying in tonight

This is a very common Dutch use of lekker.

This is a very common question.

• huis = house / home as a noun
• thuis = at home / home as an adverb

So:

• Ik ben thuis. = I am at home.
• Mijn huis is groot. = My house is big.

In your sentence, thuis is correct because it describes where you are staying: at home.

You would not normally say Ik blijf vanavond huis.

Because Dutch word order often puts time expressions fairly early in the sentence, often after the verb.

So this pattern is very normal:

• Ik blijf vanavond thuis.
• Ik werk morgen thuis.
• Ik ga volgende week naar Amsterdam.

A useful beginner pattern is:

subject + verb + time + other information

That is exactly what you have here:

• Ik = subject
• blijf = verb
• vanavond = time
• lekker thuis = rest of the sentence

Yes, that is possible, but it sounds a bit different.

• Ik blijf vanavond lekker thuis = the most neutral/natural order
• Ik blijf thuis vanavond = possible, but it gives slightly more focus to thuis or can sound a little less natural in everyday speech

Dutch word order is flexible, but some orders sound more natural than others. For a learner, Ik blijf vanavond lekker thuis is an excellent standard version.

Yes, it can be.

The verb is thuisblijven = to stay at home.

So you may see:

• Ik blijf thuis.
• Ik wil vanavond thuisblijven.

Both are correct. The difference is just grammatical structure:

• blijf thuis = conjugated verb blijven
  • adverb thuis
• thuisblijven = full infinitive verb

In your sentence, Ik blijf vanavond lekker thuis is completely natural.

Yes, it is neutral to informal, and very natural in spoken Dutch.

Especially lekker gives it a casual, everyday tone. It sounds like something you would say to friends, family, or colleagues in normal conversation.

Without lekker, the sentence becomes more plain:

• Ik blijf vanavond thuis. = I’m staying home tonight.

With lekker, it sounds warmer and more conversational:

• Ik blijf vanavond lekker thuis.

Yes.

Dutch blijven often corresponds to both English verbs:

• to stay
• to remain

Examples:

• Ik blijf thuis. = I’m staying home.
• Hij blijft rustig. = He remains calm.

In your sentence, the meaning is clearly to stay.

Because Dutch uses thuis by itself to mean at home.

So English often says:

• I’m staying at home

But Dutch simply says:

• Ik blijf thuis

You do not need a separate word for at here.

A rough English-friendly guide:

• blijf ≈ blife
  The ij sound is a Dutch diphthong, somewhat like the vowel in my, but not exactly the same.

• vanavond ≈ vahn-uh-fohnt
  Stress is on avond: van-a-VOND.

• lekker ≈ LEK-ur
  Short e, and the r at the end depends on accent.

• thuis ≈ something like thowys or thuice, but there is no perfect English equivalent
  The ui sound is one of the harder Dutch vowels for English speakers.

The hardest sounds here for most learners are:

• ij in blijf
• ui in thuis

Yes. Some common alternatives are:

• Ik blijf vanavond gewoon thuis.
  = I’m just staying home tonight.

• Ik blijf vanavond rustig thuis.
  = I’m staying home quietly / taking it easy at home tonight.

• Ik blijf vanavond gezellig thuis.
  = I’m staying home and keeping it cozy / pleasant tonight.

Each word gives a slightly different feeling:

• lekker = nice, pleasant, cozy, enjoyable
• gewoon = simply, just
• rustig = quietly, calmly
• gezellig = cozy, convivial, pleasant atmosphere

Often, yes.

Ik blijf vanavond lekker thuis commonly suggests:

• I’m not going out tonight
• I’ve decided to stay in
• staying home feels nice

It can carry a slight contrast with going out, even if that is not said explicitly.

For example, if someone asks:

• Ga je mee uit vanavond? = Are you coming out tonight?

You could answer:

• Nee, ik blijf vanavond lekker thuis.

That sounds very natural.

You can use it in both, but it is especially common in spoken and informal written Dutch, such as:

• text messages
• chats
• social media
• casual emails

In more formal writing, you might be less likely to use lekker in this broad, conversational way. But the sentence itself is perfectly correct Dutch.