unprecedented

Unprecedented is a related term of fantastic.

As adjectives the difference between unprecedented and fantastic

is that unprecedented is never before seen or done, without precedent while fantastic is fantastic.

As adjectives the difference between unheralded and unprecedented

is that unheralded is without prior warning; unexpected or unannounced while unprecedented is never before seen or done, without precedent.

As adjectives the difference between unprecedented and groundbreaking

is that unprecedented is never before seen or done, without precedent while groundbreaking is innovative; new, different; doing something that has never been done before.

As a noun groundbreaking is

a ceremony to mark the beginning of construction.

As adjectives the difference between unprecedented and unprejudiced

is that unprecedented is never before seen or done, without precedent while unprejudiced is not prejudiced.

As adjectives the difference between unprecedented and loyal

is that unprecedented is never before seen or done, without precedent while loyal is having or demonstrating undivided and constant support for someone or something.

As a proper noun Loyal is

a town in Oklahoma.

As adjectives the difference between unprecedented and innovative

is that unprecedented is never before seen or done, without precedent while innovative is characterized by the creation of new ideas or things.

As adjectives the difference between agnostic and unprecedented

is that agnostic is of or relating to agnosticism or its adherents while unprecedented is never before seen or done, without precedent.

As a noun agnostic

is a person who holds to a form of agnosticism, especially uncertainty of the existence of a deity.

As adjectives the difference between novel and unprecedented

is that novel is new, original, especially in an interesting way while unprecedented is never before seen or done, without precedent.

As a noun novel

is a novelty; something new.