mad

the word 'mad' originates from the old english adjective 'gemǣd', which conveyed a state of being insane, foolish, or out of one's mind. this old english term is believed to be derived from the proto-germanic root 'ga-maid-az', meaning 'changed (for the worse), abnormal', which itself is linked to the proto-indo-european root 'moi-', signifying 'to change, exchange'. the core semantic thread from its ancient roots is a departure from a normal or sound state of mind. over time, the meaning broadened from describing clinical insanity to encompass intense, uncontrolled emotions like rage (as in 'mad with anger') and later, colloquially, to extreme enthusiasm (as in 'mad about football').

the word is a simplex form. it is a middle english word inherited from old english 'gemǣd', 'gemǣded' (meaning 'insane, foolish'), which is related to the verb 'gemǣdan' ('to make insane or foolish').