Reverse Dictionary: SHALLOW

ADJECTIVES
1895 EBB-MINDED shallow, frivolous → Eng. dial.
1899 DIPPY shallow-minded, simple-minded, foolish, idiotic → US sl.

NOUNS – PERSON
1706 MOPSEY — MOPSIE — MOPSY a shallow or frivolous woman 
2009FLUFFHEAD a shallow, superficial person → Amer. sl. (Bk.)