conceitless

conceit +‎ -less

conceitless (not comparable)

1. (obsolete) Stupid; thoughtless; dull.
   • c. 1590–1591 (date written), William Shakespeare, “The Two Gentlemen of Verona”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act IV, scene ii]:

     Think’st thou I am so shallow, so conceitless,
     To be seduced by thy flattery,
     That hast deceived so many with thy vows?

   • 1614, William Browne, The Shepheards Pipe, London: George Norton, The First Eglogue,

     He thus departeth as God would harmlesse;

     And forth of auenture his way is went,

     But whitherward he draw, he conceitlesse

     Was, he nat knew to what place he was bent.

• conceitful