Definition of "obscurely"

I vvill this Night, / in ſeuerall Hands, in at his VVindovves throvv, / As if they came from ſeuerall Citizens, / VVritings, all tending to the great opinion / That Rome holds of his Name: vvherein obſcurely / Cæſars Ambition ſhall be glanced at.

1599 (first performance), William Shakespeare, “The Tragedie of Iulius Cæsar”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act I, scene ii], page 112, column 2