Having height and width, for short, 4 letters
Having length and width only, briefly, 4 letters
Having only length and width, 4 letters
Lacking depth spatially, 4 letters
Lacking depth, for short, 4 letters
Lacking depth, in brief, 4 letters
Like a plane, for short, 4 letters
Like flicks seen without special glasses, 4 letters
Like traditional movies, for short, 4 letters
Not giving an illusion of depth, briefly, 4 letters
Pretty much all surface, for short, 4 letters
Octet of black squares in the middle of this grid, typographically, 9 letters
Like a weekend seminar, 6 letters
Like some Disneyland passes, 6 letters
Weekend duration, maybe, 7 letters
Program on which pundits talk for 48 straight hours?, 10 letters
Having a front row and a back row, 7 letters
Four-times-a-year magazine?, 20 letters
Like many racetrack bets, 9 letters
Cheap bathroom fixture?, 14 letters
Expensive bit of Morse?, 12 letters
Part 2 of the sign, 15 letters
An opinion, after hyperinflation?, 15 letters
The line forms here, 15 letters
Car-body style (3,4), 7 letters
Like a Corvette, say, 7 letters
Like an Eclipse, e.g., 7 letters