English Dictionary

underly

/ˈʌndə(ɹ)li/

adv

(rare, obsolete) At a lower level. / (chiefly colloquial) In an inferior or inadequate manner; insufficiently (chiefly in opposition to overly).

She underly apologized for her mistake.

意味（1）

(rare, obsolete) At a lower level.

The Seed-Branch […] is presently divided into two main Branches, and those two into other less; whereof some underly, others aloft, run along the Coat.

意味（2）

(chiefly colloquial) In an inferior or inadequate manner; insufficiently (chiefly in opposition to overly).

In this case, we are not in a position—at least from the perspective of the rules themselves and the values that lie behind them—to say that they are overly or underly inclusive.