unimportant (adj.)

• casual
• homely
• humble
• inconsiderable
• inferior
• inglorious
• innocuous
• insignificant
• least
• light
• low
• lowest
• lowly
• marginal
• mean
• minor
• modest
• petty
• plain
• poor
• secondary
• simple
• small
• teachable
• trivial
• undistinguished
• unpretentious