16th C. English mathematician, et al., 4 letters
Actresses Sandra and Ruby, 4 letters
Almost-failing grades, 4 letters
Barely passing grades, 4 letters
Barely passing marks, 4 letters
Below-average grades, 4 letters
Civil rights crusader Morris, 4 letters
Civil rights lawyer Morris, 4 letters
Civil rights lawyer Morris, who won a $6.3 million settlement from the Aryan Nations, 4 letters
Deejay Rick of Disco Duck fame, 4 letters
Disappointing grades, 4 letters
Disco Duck man Rick, 4 letters
Disco Duck performer, 4 letters
Disco Duck singer Rick, 4 letters
Disco Duck songwriter, 4 letters
DJ Rick of Disco Duck fame, 4 letters
DJ Rick who owns rick.com, 4 letters
Fiddle's middle duo, 4 letters
Frances and Ruby of films, 4 letters
GPA reducers, probably, 4 letters
Grades below the curve, 4 letters
Grades below the curve, perhaps, 4 letters
Honor society no-nos, 4 letters
Into the Night host, 4 letters
Less than average grades, 4 letters
Lowest passing grades, 4 letters
Marks you might hide from Mom, 4 letters
NBA guard Brown and MLB outfielder Brown, 4 letters
NBA guard Brown and the Disco Duck singer, 4 letters
Near-failing grades, 4 letters
Not grades to brag about, 4 letters
Not the best grades, 4 letters
Not-so-great grades, 4 letters
Odd couple or dead ends?, 4 letters
Poor showings in class, 4 letters
Radio Hall-of-Famer Rick, 4 letters
Reason for school probation, maybe, 4 letters
Report card concerns, 4 letters
Report-card ruiners, 4 letters
Rick ___, talk-show host, 4 letters
Rick of Disco Duck fame, 4 letters
Rick who did Disco Duck, 4 letters
Rick who sang Disco Duck, 4 letters
Rick with a weekly Top 40, 4 letters
Rick with the 1976 #1 hit Disco Duck, 4 letters
Scores in the 60s, usually, 4 letters
Scrabble 2-pointers, 4 letters
Scrabble two-pointers, 4 letters
Singers Joey and Kiki, 4 letters
Teddy Kennedy has three, 4 letters
They won't get you on the dean's list, 4 letters
They're barely passing, 4 letters
They're in the middle of middle, 4 letters
Two in the middle of middle, 4 letters
Two Scottish rivers, 4 letters
Two-pointers in Scrabble, 4 letters
Unenviable report card, 4 letters
Unsatisfactory grades, 4 letters
You're close to failing with these, 4 letters
Head of Twisted Sister, 9 letters