pervious

Often followed by to: capable of being penetrated by another body or substance, such as air or water; admitting passage.

Near-synonym: porous

a pervious soil

Capable of being seen through; open to being examined; patent, unconcealed.

[I]n their [i.e., the Egyptians'] ceremonies they uſually made three acclamations to the unknovvn Darkneſs; that is, to God, vvhoſe ſecrets are pervious to no eye, vvhoſe dvvelling is in a light that is not to be diſcerned, vvhoſe myſteries are not to be underſtood by us, and vvhoſe Sacraments are objects of faith and vvonder, but not to be diſordered by the miſtaking, undiſcerning eye of people that are curious to ask after vvhat they ſhall never underſtand.

Capable of being penetrated mentally; intelligible, understandable.

[…] Saint Auguſtine for ſharpe inſight, and concluſive judgement, in expoſition of places of Scripture, vvhich he alvvaies makes ſo liquid, and pervious, […] hath ſcarce been equalled therein, by any of the VVriters in the Church of God, […]

From being ſpies, or to ſpies pervious, / From thirſt, or ſcorne of flame, deliver us.

Of a person, etc.: susceptible to being influenced by arguments, ideas, etc.; impressionable, tractable.

Capable of penetrating or permeating.

The bodies of the Saints, […] have an agility to move from place to place vvith ſpeed and ſubtility like light; to have their vvay free and pervious through all places, and can penetrate vvhereſoever they pleaſe.

VVhat is this little, agile, pervious Fire, / This flutt'ring Motion, vvhich VVe call the Mind? / Hovv does She act? and vvhere is She confin'd?