Het was een gigantisch duur project dat onverklaarbaar mislukte.

Questions & Answers about Het was een gigantisch duur project dat onverklaarbaar mislukte.

Why is it gigantisch duur and not gigantische duur?
In this sentence, gigantisch acts as an adverb of degree modifying the adjective duur—it means the project was gigantically expensive, not that it was both gigantic and expensive. Adverbs of degree never get an -e ending.
Why doesn't the adjective duur get an -e ending here?
Because project is a neuter noun (a het-word). When a het-word is preceded by the indefinite article een, the adjective in front of it loses its -e ending. If you used the definite article, it would become het gigantisch dure project.
Both gigantisch and onverklaarbaar lack an -e ending. Is it for the exact same reason?
They are both adverbs, which makes them invariant (no -e ending), but they do slightly different jobs in the sentence. Gigantisch is an adverb of degree modifying an adjective (duur). Onverklaarbaar is a standard adverb modifying a verb—it describes how the project failed (mislukte).
Why do we use dat to say "that failed" instead of die?
Dat is a relative pronoun referring back to project. Because project is a het-word, you must use dat. If it had been a de-word (like de missie), you would use die onverklaarbaar mislukte.

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