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Ostensibly vs Probably - What's the difference?

ostensibly | probably |

As adverbs the difference between ostensibly and probably

is that ostensibly is seemingly, apparently, on the surface while probably is in all likelihood.

ostensibly

English

Adverb

(-)
  • (modal) seemingly, apparently, on the surface
  • * 1889 , Leslie Stephen, Sidney Lee, Dictionary of national biography
  • On 13 June the peshwa signed a new treaty, ostensibly complying with the demands of the British government...
  • *
  • Up to a year or two ago it had been the custom to kill horses in the yards — ostensibly for fertilizer...
  • * 2007 , Brian Herbert, Kevin J Anderson, Sandworms of Dune
  • People strive to achieve perfection — ostensibly an honorable goal — but complete perfection is dangerous. To be imperfect, but human, is far preferable.

    Synonyms

    * (seemingly) apparently, arguably, at first blush, seemingly, ostensively

    probably

    English

    Alternative forms

    * (colloquial)

    Adverb

    (en adverb)
  • In all likelihood.
  • *{{quote-book, year=1922, author=(Ben Travers), title=(A Cuckoo in the Nest)
  • , chapter=1 citation , passage=“[…] the awfully hearty sort of Christmas cards that people do send to other people that they don't know at all well. You know. The kind that have mottoes
  • *{{quote-magazine, year=2013, month=May-June, author= William E. Conner
  • , title= An Acoustic Arms Race , volume=101, issue=3, page=206-7, magazine=(American Scientist) , passage=Earless ghost swift moths become “invisible” to echolocating bats by forming mating clusters close

    Synonyms

    * (in all likelihood) likely, perhaps, maybe, possibly, presumably, most likely, doubtless, in all probability, perchance, as likely as not, as like as not