unheimlich
creepy
Causing a feeling of slight horror, fear, or unease; frightening in a mysterious way.
Es war unheimlich still im Wald, man hörte nicht einmal einen Vogel.
It was creepily quiet in the forest; you couldn't even hear a bird.

creepy / very
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creepy
Causing a feeling of slight horror, fear, or unease; frightening in a mysterious way.
Es war unheimlich still im Wald, man hörte nicht einmal einen Vogel.
It was creepily quiet in the forest; you couldn't even hear a bird.

'Unheimlich' (creepy/very) is made up of 'un-' (not), 'Heim' (home), and '-lich'. The literal meaning is therefore 'not like home', 'unfamiliar'. From this developed the modern meaning 'creepy' or 'unsettling'.
In dem alten Haus herrschte eine unheimliche Atmosphäre.
There was a creepy atmosphere in the old house.
The meaning of 'unheimlich' depends on its function in the sentence. If it describes a noun, it means 'creepy'. If it comes before another adjective or verb to intensify it, it colloquially means 'very' or 'extremely'.
Plötzlich hörte ich ein unheimliches Geräusch aus dem Keller.
Suddenly I heard a creepy noise from the basement.
The use of 'unheimlich' as an intensifier meaning 'very' is typical of spoken language and informal style. It is used less often in formal or written texts.
Ich habe mich unheimlich über dein Geschenk gefreut!
I was really happy about your gift!
very
'sehr' and 'unheimlich' can both be used as intensifiers. In sentences like 'sehr schön' (very beautiful) and 'unheimlich schön' (really beautiful), the basic meaning is similar. 'sehr' is neutral and suitable everywhere. 'unheimlich' sounds more colloquial and often a bit stronger or more personal. In formal texts, you usually use 'sehr'. In everyday language, 'unheimlich' can sound natural when you want to emphasize a statement especially strongly.

Am Bahnhof war unsere Tasche unheimlich schwer.
At the train station, our bag was really heavy.
Zum Einkaufen brauche ich morgen sehr viel Zeit.
I need a lot of time for shopping tomorrow.