adverb
consistently; from beginning to end; throughout
A yojijukugo meaning that an attitude, policy, or state remains unchanged from start to finish. Often used in formal or written contexts.
彼は終始一貫して自分の意見を主張した。
He consistently asserted his opinion from beginning to end.
会社の方針は終始一貫して変わらなかった。
The company's policy remained unchanged throughout.