无疑 (wú yí): Несомненно,

He won the company's best sales award three years in a row; he is undoubtedly the most capable employee on the team.

This bridge has withstood a century of wind and rain and remains sturdy, undoubtedly proving the superb craftsmanship of the artisans back then.

The police found the suspect's fingerprints at the scene; this is undoubtedly the most crucial clue for solving the case.

Reading for half an hour every day will undoubtedly greatly improve your vocabulary and expression skills in the long run.

It suddenly started pouring; we would undoubtedly get soaked, so we'd better wait at the store entrance for a while.