
furchtbar
terrible
Very bad, awful, or frightening.
Der Film war so furchtbar, dass wir früher gegangen sind.
The movie was so terrible that we left early.
terrible
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terrible
Very bad, awful, or frightening.
Der Film war so furchtbar, dass wir früher gegangen sind.
The movie was so terrible that we left early.

terribly
As an adverb to strengthen or intensify an adjective or verb; means 'very' or 'extremely'.
Nach der langen Wanderung war ich furchtbar müde.
After the long hike, I was terribly tired.
'Furchtbar' (terrible) is derived from the noun 'die Furcht' (fear). The ending '-bar' means something like '-able' or 'full of'. Something that is 'furchtbar' is therefore literally 'fear-inducing' or 'terrible'.
Die Zerstörung nach dem Sturm war ein furchtbarer Anblick.
The destruction after the storm was a terrible sight.
The meaning of 'furchtbar' (terrible / terribly) depends on its position. If it describes a noun, it means 'terrible'. If it stands before another adjective, it intensifies that adjective and means 'very' or 'extremely'.
Wir hatten gestern ein furchtbares Gewitter.
We had a terrible thunderstorm yesterday.
As an intensifying word, 'furchtbar' (terribly) is very popular in colloquial speech. Interestingly, it can intensify both positive and negative qualities.
Dein neues Kleid ist furchtbar schön!
Your new dress is terribly beautiful!
very
Sehr and furchtbar can express a high level of intensity. Sehr is a neutral intensifier, while furchtbar sounds more emotional and stronger, often suggesting a negative evaluation. Sehr suits a matter-of-fact statement; furchtbar can fit when the discomfort is clearly felt.

Nach dem langen Lauf war ich furchtbar müde.
After the long run, I was terribly tired.
Nach dem langen Lauf war ich sehr müde.
After the long run, I was very tired.