'原始' (yuán shǐ) is an adjective meaning 'primitive' or 'original', describing something in its earliest, most basic, or undeveloped state. The character 原 (yuán) means 'origin', 'source', or 'original', while 始 (shǐ) means 'beginning' or 'to start'. Together, they emphasize the very first stage of existence or development — before refinement, modernization, or human intervention. It often carries a neutral or slightly academic tone and appears frequently in scientific, historical, or anthropological contexts.

This word commonly modifies nouns like 社会 (shèhuì, 'society'), 文明 (wénmíng, 'civilization'), 森林 (sēnlín, 'forest'), or 动物 (dòngwù, 'animal'). For example, 原始社会 refers to 'prehistoric society', and 原始森林 means 'primeval forest' — untouched, ancient woodland. Unlike 古老 (gǔlǎo, 'ancient'), which stresses age alone, 原始 stresses simplicity, lack of development, and closeness to origins.