The Spanish word 'culpable' meaning 'guilty' or 'culpable' comes from the Latin word 'culpabilis' meaning 'blameworthy'. This Latin word was formed by combining the verb 'culpare' ('to blame or accuse') with the suffix '-bilis' (indicating possibility). The verb 'culpare' itself derived from the Latin noun 'culpa' meaning 'fault' or 'blame'.

This etymology shows how the word developed from the basic concept of 'fault/blame' into an adjective describing someone who can be blamed or is deserving of blame, maintaining a remarkably consistent meaning from Latin to modern Spanish.

Some related Spanish words include 'culpa' (fault, blame, guilt) and 'culpar' (to blame), which come directly from the same Latin roots. These words form a family of related terms all dealing with blame and responsibility. While 'culpa' is the noun form and 'culpar' is the verb, 'culpable' is the adjective describing someone who bears the blame or guilt.

The English word 'culpable' is a direct cognate of the Spanish word, also coming from Latin 'culpabilis'. Both languages preserved the word with very similar spelling and meaning. Other related English words include 'culprit' (someone who is guilty of a fault or crime) and 'exculpate' (to clear from blame), both of which contain the same Latin root 'culpa'.