clearly; plainly; distinctly
to be clear; to be definite; to be certain; to be exact; to become clear; to clear up
clearly (standing out); distinctly; sharply; boldly; in sharp relief
はっきり聞こえませんでした。
I couldn't hear clearly.
はっきり答えてください。
Please answer clearly.
はっきりした理由がわかりません。
I don't know a clear reason.