
voll
full
Filled to the edge or completely filled; offering no more space for anything else.
Die Flasche ist noch fast voll.
The bottle is still almost full.
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full
Filled to the edge or completely filled; offering no more space for anything else.
Die Flasche ist noch fast voll.
The bottle is still almost full.

crowded
Filled with many people; overcrowded.
Am Samstagvormittag ist es in der Innenstadt immer sehr voll.
On Saturday mornings, the city center is always very crowded.

really
Colloquial intensifier with the meaning of 'very' or 'totally'.
Der Film war voll langweilig.
The movie was really boring.

complete
Concerning the entire, complete extent.
Sie hat meine volle Unterstützung für ihr Projekt.
She has my full support for her project.

drunk
Colloquial for very drunk.
Er war auf der Party gestern Abend komplett voll.
He was completely drunk at the party last night.
If you want to express what something is filled with, you can use the prepositions 'mit' (with) or 'von' (of/with). Both take the dative. The form 'voll mit' (full of/with) is somewhat more common in everyday speech.
Der Korb ist voll mit frischem Obst.
The basket is full of fresh fruit.
In colloquial speech, 'voll' (really/totally) is often used like 'sehr' (very) or 'total' (totally) to intensify an adjective or adverb. It then comes directly before the word it intensifies.
Wow, dein neues Fahrrad ist voll schön!
Wow, your new bike is really nice!
The meaning 'betrunken' (drunk) is very colloquial. It is used only in informal situations among friends or acquaintances.
Nach der Feier waren einige Gäste ziemlich voll.
After the party, some guests were pretty drunk.
In the meaning 'komplett' (complete), 'voll' is often used in fixed expressions with abstract nouns. Typical examples are 'ein voller Erfolg' (a complete success), 'volle Absicht' (full intention), or 'in vollem Gange sein' (to be in full swing).
Das Konzert war ein voller Erfolg.
The concert was a complete success.
In the basic meaning 'gefüllt' (filled), 'voll' is often combined with containers or places. Common collocations are 'ein volles Glas' (a full glass), 'ein voller Tank' (a full tank), or 'ein voller Teller' (a full plate).
Mit vollem Tank können wir bis nach München fahren.
With a full tank, we can drive all the way to Munich.
very
Sehr and voll can indicate a high degree when used before an adjective. Sehr is the neutral standard form. Voll is a colloquial intensifier that is not used in the same way everywhere, so it is mainly suitable for casual conversations.

Nach dem Konzert erzählt Nina ihren Freunden, dass es voll laut war.
After the concert, Nina tells her friends that it was really loud.
In der Bewertung schreibt Nina, dass das Konzert sehr laut war.
In her review, Nina writes that the concert was very loud.