The meaning of hard is not easily penetrated See ‘meaning & use’ for definitions, usage, and quotation evidence. Not easily yielding to pressure
How to use hard in a sentence There are 83 meanings listed in oed's entry for the word hard, two of which are labelled obsolete Not easy to bend, cut, or break
Something that is hard is very firm and stiff to touch and is not easily bent, cut, or broken He shuffled his feet on the hard wooden floor. Well protected from an attack, as by aerial bombardment Bunkers and other hard targets
Requiring great effort or endurance Performed with or marked by great diligence or energy A project that required years of hard work. Definition of hard adjective in oxford advanced learner's dictionary
Difficult or troublesome with respect to an action, situation, person, etc. Difficult to deal with, manage, control, overcome, or understand
