Doubtable vs Questionable - What's the difference?

In obsolete|lang=en terms the difference between doubtable and questionable

is that doubtable is (obsolete) fearsome; redoubtable while questionable is (obsolete) inviting questions; inviting inquiry.

As adjectives the difference between doubtable and questionable

is that doubtable is (uncommon) capable of being doubted; doubtful; dubious; dubitable see usage notes below while questionable is (obsolete) inviting questions; inviting inquiry.

doubtable

English

Adjective

(en adjective)

(uncommon) Capable of being doubted; doubtful; dubious; dubitable. See usage notes below.

* 1971 , L. J. Swingle, "On Reading Romantic Poetry," PMLA , vol. 86, no. 5, p. 976,

Descartes adopts the tool of a radical skepticism, submitting to question established beliefs, exposing them to the test of doubt, breaking them down when they prove doubtable .

(obsolete) Fearsome; redoubtable.

Usage notes

Philosophers often use "doubtable" in its literal sense of "capable of being doubted." In other scholarly and literary contexts, the more accepted direct synonym of "doubtable" is "dubitable." In all other usage, "doubtful" and "dubious" are far more common synonyms.

Synonyms

* (doubtful, dubious, capable of being doubted): uncertain

Derived terms

* undoubtable

References

* * * * Oxford English Dictionary , 2nd ed., 1989.

questionable

English

Alternative forms

* (archaic)

Adjective

(en adjective)

(obsolete) Inviting questions; inviting inquiry.

* Shakespeare, Hamlet :

Thou comest in such a questionable shape.

Problematic; open to doubt or challenge.

It is questionable if the universe is open or closed.

Of dubious respectability or morality.

Tiffiny's behavior is highly questionable .