Answer:

secretive

Answer	Crossword Clue
SECRETIVE	Frank's opposite
SECRETIVE	Not open.
SECRETIVE	Reticent.

SECRETIVE	Close-mouthed
SECRETIVE	Not open
SECRETIVE	Uncommunicative

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.