unbelievably

Unbelievably is an adverb used to express a very high degree, often to the point of challenging belief. It modifies adjectives, other adverbs, or verbs to indicate that something is beyond what is expected or plausible. The word is formed from unbelievable (the adjective) plus the suffix -ly. Unbelievable itself comes from belief, via the root believe, with the negating prefix un- and the -able suffix; unbelievably adds the adverbial -ly ending.

In usage, unbelievably tends to carry a strong evaluative meaning and is common in everyday speech, journalism, and creative writing. It is frequently used for hyperbole or to convey astonishment, admiration, or incredulity, but can also express skepticism depending on context and tone. It is not always appropriate in formal or technical writing, where more precise terms like remarkably, extraordinarily, or exceptionally might be preferred.

Examples include: "The concert was unbelievably loud." "The gymnast moved unbelievably quickly." "The claim turned out to be unbelievably false." The word is widely understood in varieties of English and tends to be informal or emphatic, though it remains a recognizable intensifier across registers.