
zweifellos
undoubtedly
Without any doubt; completely certain and indisputable.
Sie ist zweifellos die beste Kandidatin für den Job.
She is undoubtedly the best candidate for the job.
undoubtedly
Loading your saved state.

undoubtedly
Without any doubt; completely certain and indisputable.
Sie ist zweifellos die beste Kandidatin für den Job.
She is undoubtedly the best candidate for the job.
The word is made up of 'der Zweifel' (doubt) and the ending '-los' (-less). The ending '-los' means 'without', so 'zweifellos' (undoubtedly) literally means 'without doubt'.
Seine Argumente waren logisch und zweifellos überzeugend.
His arguments were logical and undoubtedly convincing.
As an adverb, 'zweifellos' (undoubtedly) is flexible. It can stand at the beginning of the sentence in position 1 (then the verb follows) or inside the sentence, usually after the verb and the subject.
Zweifellos ist dies die beste Lösung für das Problem.
Undoubtedly, this is the best solution to the problem.
'Zweifellos' (undoubtedly) is used to make a statement sound especially strong and certain. It gives an opinion or statement more weight and persuasive force.
Er hat hart für seinen Erfolg gearbeitet, das ist zweifellos wahr.
He worked hard for his success; that is undoubtedly true.
certain / specific
Bestimmt can express a strong personal expectation without objectively ruling out every doubt. Zweifellos, by contrast, presents a statement as indisputable. Bestimmt fits a confident assessment; zweifellos fits a statement supported by clear facts.

Nach ihren eindeutig belegten Erfolgen ist Lara zweifellos die richtige Kandidatin.
Given her clearly documented successes, Lara is undoubtedly the right candidate.
Meiner Einschätzung nach ist Lara bestimmt die richtige Kandidatin.
In my estimation, Lara is definitely the right candidate.