reckless
‘careless, negligent, disregardful of consequences’
Lexical development traced from the Tamil root:
E. reccileas, recelæas, rechiless, rechelys, wretchlesse, wreaklesse, reckles < M.E. recheles < O.E. receleas ‘careless, thoughtless, heedless’ < reccileas ‘not recking (of consequences)’ < rece, recce ‘care, heed’ < reccan ‘to care’ < W-G. rokjan < Proto-G. rokja- + less < rek < reg- < Tamil aracaṉ