schrecklich
terrible
Describes something that is very unpleasant, awful, or of very poor quality.
Der Film war schrecklich, ich bin fast eingeschlafen.
The film was terrible; I almost fell asleep.

terrible
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terrible
Describes something that is very unpleasant, awful, or of very poor quality.
Der Film war schrecklich, ich bin fast eingeschlafen.
The film was terrible; I almost fell asleep.

The adjective 'schrecklich' (terrible) is derived from 'der Schreck' (sudden, great fear). So it originally describes something that causes terror or fear.
Ein schrecklicher Sturm zog über das Land.
A terrible storm moved across the country.
The meaning of 'schrecklich' depends on its position. If it describes a noun, it means 'furchtbar' (terrible/awful). If it stands before another adjective or adverb, it means 'sehr' (very) or 'extrem' (extremely).
Das war ein schrecklicher Fehler.
That was a terrible mistake.
In the meaning 'furchtbar' (terrible/awful), 'schrecklich' is often used to describe negative events, conditions, or qualities: ein schrecklicher Unfall (a terrible accident), schreckliche Schmerzen (terrible pain), schreckliches Wetter (terrible weather).
Sie hat nach dem Sport schreckliche Kopfschmerzen.
She has terrible headaches after exercising.
As an intensifier, 'schrecklich' (terribly) is often used in colloquial language. It can intensify both negative and positive adjectives.
Deine neue Frisur finde ich schrecklich schön!
I think your new hairstyle is terribly pretty!
very
'sehr' and 'schrecklich' can both intensify an adjective or adverb. 'sehr' is neutral and fits almost anywhere. 'schrecklich' as an intensifier also means 'very' or 'extremely', but it sounds stronger and often more emotional. It fits especially well when something seems unpleasant, tiring, or stressful. But be careful: 'schrecklich' can also mean 'terrible' in its own right. As an intensifier, it comes directly before another word, for example 'schrecklich müde' (terribly tired).

Nach dem langen Gespräch bin ich schrecklich müde.
After the long conversation, I am terribly tired.
Jonas ist heute sehr zufrieden mit seinem Einkauf.
Jonas is very happy with his purchase today.