adverb/sɑ̃ dut/
no doubt, most probably, most likely
“Il vaut sans doute mieux que tu ne lui en dises rien.” — It's probably better that you say nothing to him about it.
Synonyms: apparemment, censément, peut-être, possiblement, probablement, vraisemblablement
Related: sans aucun doute, sans nul doute