Je suis complètement fatigué ce soir.

In French, states like being tired, being hungry, or being happy are usually expressed with être (to be) or sometimes with other structures, not always the same way as in English.

So:

• Je suis fatigué = I am tired

French treats fatigué as an adjective, so it goes with être:

• je suis = I am
• fatigué = tired

Using j’ai fatigué would mean something completely different and would not be the normal way to say I am tired.

Complètement means completely or totally.

So:

• Je suis complètement fatigué = I am completely/totally tired

It intensifies fatigué. In everyday English, I’m completely exhausted might sound more natural, but the direct meaning is still completely tired.

Because complètement is an adverb, and in this sentence it modifies the adjective fatigué.

In French, adverbs often come before the adjective they modify:

• complètement fatigué = completely tired
• vraiment heureux = really happy
• très content = very happy/glad

So the order is normal:

• adverb + adjective

The form of the adjective changes depending on the gender of the person speaking.

If the speaker is masculine, use:

• fatigué

If the speaker is feminine, use:

• fatiguée

So:

• Je suis complètement fatigué ce soir. = said by a male speaker
• Je suis complètement fatiguée ce soir. = said by a female speaker

The meaning stays the same.

Ce soir means this evening or tonight, depending on context.

So the full sentence can be understood as:

• I’m completely tired this evening
• I’m completely tired tonight

Both are good translations.

A useful comparison:

• ce matin = this morning
• cet après-midi = this afternoon
• ce soir = this evening / tonight

Yes. French often allows this kind of movement for time expressions.

You can say:

• Je suis complètement fatigué ce soir.
• Ce soir, je suis complètement fatigué.

Both are correct.
The second version puts a little more focus on tonight.

It is understandable and correct, but in everyday French, some speakers might more naturally say:

• Je suis très fatigué ce soir. = I’m very tired tonight
• Je suis crevé ce soir. = I’m exhausted tonight / I’m wiped out tonight
  (crevé is more informal)

So complètement fatigué is grammatical, but très fatigué is probably more common in ordinary speech.

A simple approximate pronunciation is:

zhuh swee kohm-pleh-tuh-mahn fah-tee-gay suh swahr

A few helpful notes:

• je sounds like zhuh
• suis sounds like swee
• complètement has a nasal ending in -ment
• fatigué ends with a clear ay sound
• soir sounds roughly like swahr

You do not pronounce it word by word in a very choppy way in natural speech; it flows together smoothly.

You pronounce the final -é because it represents the sound ay.

So:

• fatigué = pronounced roughly fah-tee-gay

But you do not pronounce silent final consonants that are not sounded in normal French pronunciation.

This is important because:

• fatigué is pronounced
• the written accent é helps show that the final vowel is pronounced

Yes. If the time is already clear from context, you can simply say:

• Je suis complètement fatigué.

That means:

• I’m completely tired
• I’m totally tired

Adding ce soir just gives a time reference: tonight / this evening.