
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.

terribly
Used as an adverb to intensify another adjective or adverb and means 'very' or 'extremely'.
Ich bin heute schrecklich müde.
I'm terribly tired today.
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!
terrible
Schrecklich and furchtbar can both express a very negative evaluation. Schrecklich is broader in everyday use and can also simply describe something of poor quality, while furchtbar can sound more dramatic or frightening. Schrecklich is usually enough for a bad film, while furchtbar often fits a distressing scene.

Der schlecht gemachte Film war trotz seiner schönen Bilder schrecklich.
The poorly made film was terrible despite its beautiful images.
Die Szene mit dem verletzten Kind war für viele Zuschauer furchtbar.
The scene with the injured child was terrible for many viewers.