Selfish; prioritizing one's own interests or convenience over others'. Often used negatively to describe someone who disregards others' needs.
彼の利己的な行動が原因でチームは失敗した。
His selfish behavior caused the team to fail.
利己的に振る舞う人は信頼を失いやすい。
People who act selfishly tend to lose trust.
その決定は個人的な利益を優先する利己的な判断だった。
That decision was a selfish judgment that prioritized personal gain.