Alternative spelling of hardheaded

A thin horizontal bony plate of the skull, located in the roof of the mouth.

(US) An alcopop resembling lemonade.

(two-up) A crooked organiser of a two-up game, who would cheat players out of their money.

(computer hardware) One of a series of parallel magnetic recording disks in a drive unit, used for the recording and retrieval of digital information; used especially in personal computers.

In severe difficulties; greatly affected by a problem.

Alternative form of hard-and-fast

(idiomatic, of rules, etc) strictly maintained

guided by practical experience and observation rather than by theory / (idiomatic) hardheaded, stubborn / (of a person) tough and relentlessly practical and thus not given to sentiment.

(computing) A device used for storing large amounts of data for a computer that persist while the computer is turned off.