unchecked

Unrestrained, not held back.

unchecked ambition

unchecked power

Not examined for accuracy, efficiency, etc.

unchecked writings

unchecked findings

Of a check box: not checked (ticked or enabled).

This pseudocode is unambiguous if we know that the previous state of all the boxes is "unchecked." Because we can't be sure of that in buggy code, a better model might be: […]

Check boxes are a handy way to enable users to select one or more options that are not mutually exclusive. […] By default, [Microsoft] Word displays boxes unchecked.

Of a square: part of only one entry (that is, across or down, but not both).

If there are W#95;1 "unchecked" whites (that is, those which enter into the solution of one clue only), and W#95;2 "checked" whites (those which enter into the solution of two clues), then the mean word length will be (W#95;1#43;2W#95;2)#47;C, where C is the number of clues. […] Acceptable (if unwelcome) difficulties arise when the initial letters of words occupy unchecked squares, because no hint then derives from other clues as to how that word will start. In six consecutive crossword puzzles in The Times, 16 per cent of the words had unchecked initial letters.

On a crossword puzzle grid, you shouldn't encounter any unchecked squares – white squares that are used in an Across entry but not in a Down entry, or vice versa. If unchecked squares were allowed, that would make your life harder – you'd have only one opportunity to figure out what belongs in that square. Instead, you always get two chances to fill a square: by solving the Across clue or the Down clue.