(US, film) a movie that is definitely, or most likely will be, R-rated ("Under 17 requires accompanying parent or adult guardian.") by the Motion Picture Association (MPA), typically due to having multiple scenes of violence or nudity.

plural of hard nail

(figuratively) A strong person, in character and physique.

Technology that requires big breakthroughs and has a high barrier of entry.

(travel, informal) A class of accommodation, typically on trains, which is less comfortable than other classes, and might have wooden seating.

Marked by or experiencing difficulty, as if by bad luck.

(electronics, computing) A type of error which persists even after power-cycling the equipment; associated with permanent physical damage to the equipment's hardware (for instance, from a latch-up).

plural of hard error

Ambitious, go-getting.

Alternative form of hardman.