He is regarded as very capable but unexciting.

他被认为非常有能力，但为人乏味。

...an unexciting but likeable painter.

乏味却招人喜欢的画家

...a quiet woman with a stable but equally unexciting career.

一位沉默寡言的女人，事业稳定但也平淡乏味

It was a methodical, unexciting chore.

那是一份按部就班、枯燥乏味的无聊差事。