shallow (adj.)
naive, gullible, lacking in depth of character
2H4 II.iv.232 [Falstaff to Doll, of Prince Henry] A good shallow young fellow
2H4 IV.ii.50 [Prince John to Hastings] You are too shallow ... / To sound the bottom of the after-times
AW I.iii.42 [Clown to Countess] Y'are shallow
LLL I.i.246 [King reading Armado's letter to him, of Costard] That shallow vassal
LLL V.ii.305 [Rosaline to Princess, of their visitors] Their shallow shows and prologue vilely penned
LLL V.ii.849 [Rosaline to Berowne, of his mocking] Whose influence is begot of that loose grace / Which shallow laughing hearers give to fools
R3 II.ii.18 [Duchess of York to Clarence's children] Incapable and shallow innocents
R3 IV.iv.431 [King Richard alone, of Queen Elizabeth] shallow, changing woman!
R3 V.iii.220 [King Richard to Ratcliffe] ten thousand soldiers ... led by shallow Richmond
Tem II.ii.141 [Trinculo to Stephano, of Caliban] this is a very shallow monster