Too obvious to be doubted; SYN. indubitable.
Free from doubt; certain
ETYM Latin indubitabilis: cf. French indubitable. Related to In- not, and Dubitable.
Not dubitable or doubtful; too evident to admit of doubt; unquestionable; evident; apparently certain.
Not doubted; genuine, undisputed
Without a doubt
In a manner or to a degree that could not be doubted.
With certainty; SYN. doubtless, beyond question, without doubt, beyond any doubt.