the word 'tortuous' originates from the latin adjective 'tortuosus', meaning full of twists or winding. this, in turn, derives from the latin noun 'tortus', a twisting, which comes from the past participle of the verb 'torquere', meaning to twist or wind. the proto-indo-European root terkw- lies at the heart of this family, conveying the sense of twisting. the literal meaning of a winding path evolved metaphorically to describe anything excessively complicated, convoluted, or indirect in nature, such as a tortuous argument or legal process.

Structure: tort (twisted) + uous (adjective suffix) tort (from latin 'tortus', meaning twisted or crooked, from the verb 'torquere', to twist). uous (a latin-derived adjective-forming suffix meaning 'full of' or 'characterized by').