になりがちである

tend to become

→ に
phrase Rare #42,208
tend to become A formal or literary expression meaning that someone or something is prone to becoming a certain way. Often translated as “tend to be” when the preceding word describes a state or behavior.
JA: 忙しいと、人は不注意になりがちである。
EN: When people are busy, they tend to become careless.

私達はみんな時々不注意になりがちである。

We all tend to be careless from time to time.