inefficiently

In an inefficient manner.

Japanese Meaning

非効率的に / 効率が悪い方法で

The old heating system warms the building inefficiently during the winter, causing complaints from tenants.

古い暖房システムは冬に建物を非効率的に暖め、居住者から苦情が出ています。

Sense（1）

In an inefficient manner.

more inefficiently

（ comparative ）

most inefficiently

（ superlative ）