For example, one of Ryuzo's few unblockable attacks begins with him lowering his sword into the water and spinning.

Source: https://gamerant.com/ghost-of-tsushima-shadow-of-the-samurai-walkthrough/

Garrett is a “super freak” as Cole put it, the No. 1 overall pick in the 2017 draft whose mixture of pedigree and work ethic have made him nearly unblockable one-on-one and helped him rack up 75 1/2 sacks in 85 games.

Source: https://www.mymotherlode.com/sports/nfl-general-news/3229068/myles-garrett-and-t-j-watt-are-both-one-of-ones-monday-night-provides-a-close-up-look-at-both.html

Ranrok Dragon can also launch an unblockable fireball; to avoid getting hit, the player must dodge just before the fireball collides with them.

Source: https://gamerant.com/hogwarts-legacy-how-to-beat-ranrok-dragon-tips/

Red attacks are typically charged attacks and are always unblockable, so there's no point in trying to throw up a block, and learning this will save the player a lot of effort in the long run.

Source: https://www.cbr.com/stranger-of-paradise-tips-tricks-final-fantasy/