'tormentedly' ultimately derives from the noun 'torment', which comes from Latin 'tormentum' (meaning 'a twisting, an instrument for twisting' and figuratively 'instrument of torture').

'tormentum' passed into Old French as 'torment' and into Middle English as 'torment'; the past-participle adjective 'tormented' was formed from the verb, and the adverbial suffix '-ly' produced 'tormentedly'.

Originally referring to physical twisting or torture ('tormentum'), the sense broadened to include severe mental or emotional suffering; 'tormentedly' now conveys acting in a state of intense mental anguish.