"Delicious" is a strong adjective for "tasty". Typically, you use absolute adverbs (absolutely, utterly, etc) with strong [adjectives], and gradable adverbs (very) with gradable adjectives.

Delicious本身就是一个强化版的tasty，通常，你使用绝对副词(绝对地absolutely、完全地utterly等)搭配这样的强级形容词，使用可分级副词(非常very)搭配可分级形容词。

常见的强级形容词有：

enormous, huge （巨大的）= very big

brilliant （才华出众的）= very clever

awful; terrible; disgusting; dreadful （极坏的）= very bad

certain （确信的）= very sure

excellent; perfect; ideal; wonderful; splendid （完美的）= very good

还有就是

delicious = very tasty

We do not normally use very with these adjectives. We do not say something is "very enormous" or someone is "very brilliant".

我们通常不用very来修饰这些形容词。我们不会说某件事very enormous或者某人very brilliant。