微不足道的

• inappreciable
• negligible
• insignificant
• not worth mention
• knee-high to a mosquito
• knee-high to a duck
• puny
• petit
• twopenny-halfpenny
• two-bit
• slight
• small-beer
• tin-pot
• trivial
• two by four
• potty
• pelting
• pimping
• footling
• piddling