'angriness' originates from Middle English via the adjective 'angry' (from Old Norse 'angr' meaning 'grief, sorrow') combined with the native English suffix '-ness' meaning 'state or quality.'

'angr' developed into Middle English forms like 'angry(e)', which became Modern English 'angry'; adding the suffix '-ness' produced the modern noun 'angriness'.

Initially, Old Norse 'angr' meant 'grief or sorrow', but the sense shifted toward 'anger' in English; 'angriness' came to mean 'the state of being angry'.