in-,不，非，efficient,有效率的。

1. Overall, barter is a very inefficient means of organizing transactions.

总之，易货贸易是一种效率很低的交易形式。

2. Non-state firms gradually elbow aside the inefficient state-owned ones.

非国有企业逐渐挤掉了效率低下的国有企业。

3. The protesters say the government is corrupt and inefficient.

抗议者称政府腐败无能。

4. The train company is overstaffed and notoriously inefficient.

铁路公司冗员过多，工作效率出了名地低。

5. The welfare system is grossly inequitable and inefficient.

福利制度非常不公平，效率也极低。