simplistic (adj.)

• backward
• coarse
• crude
• embryonic
• reductive
• rough
• roughhewn
• rude
• rudimentary
• stunted
• uncultivated
• uncultured
• uncut
• underdeveloped
• undeveloped
• unfinished
• unformed
• unhewn
• unpolished
• unprocessed
• unrefined
• untreated