doubt

inflection of douter:
/ inflection of douter:

no doubt, most probably, most likely

undoubtedly (without any doubt)

(formal) Alternative form of sans doute: no doubt, undoubtedly, most certainly, most probably, most likely

(transitive) to question, to call into question, to cast doubt upon, to doubt, to challenge, to second guess

benefit of the doubt

in doubt; if in doubt; when in doubt / since X was in doubt, to be on the safe side, to be safe

undoubtably; beyond the shadow of a doubt

to be a certainty, to be clear