Answer: ZERO
ZERO is a crossword puzzle answer that we have spotted 190 times.
    - Japanese plane of W.W. II
 
    - Worst possible score
 
    - Round number
 
    - No-show's score
 
    - Abysmal test score
 
    - Worst possible test score
 
    - Two before two?
 
    - One of 50
 
    - Zilch
 
    - Definitely a flunking score
 
    - Ground ___
 
    - "Beetle Bailey" boob
 
    - Home (in on)
 
    - Goose egg
 
    - Absolute twit
 
    - A definite F
 
    - Nil
 
    - Kind of tolerance
 
    - Horrible grade on a test
 
    - Round number?
 
    - Nada
 
    - Cipher
 
    - Nobody, slangily
 
    - Hardly Mr. Personality
 
    - Reset figure
 
    - It's nothing at all
 
    - Part of binary code
 
    - Abysmal grade
 
    - Bubkes
 
    - Number of tricks in a nullo
 
    - Loser
 
    - Complete drip
 
    - "Beetle Bailey" soldier
 
    - Much-repeated part of binary code
 
    - A round number ends in it
 
    - It turns a hundred into a thousand
 
    - Total loser
 
    - Number of calories in water
 
    - Absolute nobody
 
    - Nothing
 
    - It's usually a losing score
 
    - It may precede population growth
 
    - Mostel of "The Producers"
 
    - Part of ZPG
 
    - None
 
    - Unsigned point on a number line
 
    - Freezing point of water, on the Celsius scale
 
    - Speedometer's lowest reading
 
    - One of six in 1,000,000
 
    - Love, in tennis
 
    - Lowest speedometer number
 
    - Zip
 
    - Complete bomb on a test
 
    - Nobody
 
    - Absolute ___ (bottom of the Kelvin scale)
 
    - Number of items in a null set
 
    - Character in "Beetle Bailey"
 
    - Cheater's score, if caught
 
    - Dog in the comic strip "Little Annie Rooney"
 
    - Additive identity element
 
    - One of a hundred in a googol
 
    - Number that's neither positive nor negative
 
    - "Beetle Bailey" nonintellectual
 
    - Score for a gutter ball
 
    - One of a googol in a googolplex
 
    - It's not used in standard sudoku puzzles
 
    - It's an indeterminate form when raised to its own power
 
    - Gene's costar in "The Producers"
 
    - One out of 10?
 
    - Value of tens and face cards in baccarat
 
    - Maria Sharapova's love?
 
    - Sugar-free Coca-Cola variety
 
    - Roulette number that loses on bets of both even and odd
 
    - The year that wasn't?
 
    - Bit of binary code
 
    - Home (in)
 
    - 49-Across number, maybe
 
    - Reset, as an odometer
 
    - Freezing point, on the Celsius scale
 
    - Coldest possible temperature on the Kelvin scale
 
    - You can't divide by it
 
    - Blank tile value, in Scrabble
 
    - Friend of Beetle Bailey
 
    - Goose egg, in sports
 
    - 48 Across less than 48 Across
 
    - It's nothing
 
    - Little Annie Rooney's dog
 
    - Reset, with ''out''
 
    - Nothing at all
 
    - Speedometer digit
 
    - Beetle Bailey's pal
 
    - Coldest temperature on the Kelvin scale
 
    - Centigrade freezing point
 
    - Love, to Venus?
 
    - Chilling reading
 
    - Mayan mathematical innovation
 
    - Nonentity
 
    - It's nothing, really
 
    - "Beetle Bailey" simpleton
 
    - 0
 
    - World dodo population
 
    - Centigrade's freezing point
 
    - Reset
 
    - Sum of opposites
 
    - -
 
    - Reset, with "out"
 
    - Part of a shutout score
 
    - Number of remaining dodo birds
 
    - Coke ___
 
    - Reduce to nothing
 
    - Operator's number?
 
    - Worthless sort
 
    - Half of 10?
 
    - Half of ten 
 
    - Half of ten 
 
    - Celsius freezing point of water
 
    - Number line center
 
    - Japanese plane
 
    - Round figure?
 
    - Winning score in darts
 
    - Binary digit
 
    - Celsius equivalent of 32 degrees Fahrenheit
 
    - Diddly-squat
 
    - Celsius freezing point
 
    - Diddly
 
    - Nothing, in a sports score
 
    - Less than one
 
    - It means nothing
 
    - Naught
 
    - One goes after it
 
    - Number that is neither positive nor negative
 
    - It may be absolute
 
    - Complete loser
 
    - Squat
 
    - Number that shouldn't be a denominator
 
    - Lowest of the low?
 
    - 3-2-1 follower
 
    - Open love?
 
    - Centigrade freezing point of water
 
    - One minus one
 
    - "___ Dark Thirty"
 
    - Nothing at Wimbledon
 
    - Not a one
 
    - Shutout score feature
 
    - Terrible test score
 
    - Zippo
 
    - Celsius temperature at which water freezes
 
    - Focus, with "in"
 
    - Skipped-over year
 
    - Green roulette bet
 
    - Loser, informally
 
    - "Beetle Bailey" blockhead
 
    - Dismal attendance count
 
    - Abysmal score
 
    - 15 minus 15
 
    - Cold temperature
 
    - 32° Fahrenheit, in Celsius
 
    - Today's dodo count
 
    - MapMyWalk starting point
 
    - ZPG part
 
    - Nothing amount
 
    - Gutter ball's pin count
 
    - Goose egg, so to speak
 
    - "The big doughnut"
 
    - Odometer's initial reading
 
    - Any digit in a googol after the first one
 
    - The "x" in Euler's Identity: e^(i*pi) + 1 = x
 
    - Lowest number not found on a grandfather clock
 
    - ___-g
 
    - - g
 
    - Test score for a cheater, if caught
 
    - Lowest grade
 
    - Digit in binary code
 
    - Unusable divisor
 
    - None at all
 
    - ___ tolerance
 
    - "Holes" character with a numerical nickname
 
    - Worst possible mark on a test
 
    - Olive oil's carb count
 
    - Any number minus itself
 
    - Absolute ___ (coldest possible temperature)
 
    - Score of a shutout
 
    - It precedes one
 
    - It doesn't mean a thing
 
    - Freezing point in Celsius
 
    - From ___ to hero
 
    - Number resembling an egg
 
    - Actor Mostel
 
    - 67 minus 67
 
    - Love in tennis