Something he left imperfect in the state. Shak.

Why, then, your other senses grow imperfect. Shak.

He . . . stammered like a child, or an amazed, imperfect person. Jer. Taylor.

Nothing imperfect or deficient left
Of all that he created. Milton.

Then say not man's imperfect, Heaven in fault;
Say rather, man's as perfect as he ought. Pope.

Imperfect arch, an arch of less than a semicircle; a skew arch. -- Imperfect cadence (Mus.), one not ending with the tonic, but with the dominant or some other chord; one not giving complete rest; a half close. -- Imperfect consonances (Mus.), chords like the third and sixth, whose ratios are less simple than those of the fifth and forth. -- Imperfect flower (Bot.), a flower wanting either stamens or pistils. Gray. -- Imperfect interval (Mus.), one a semitone less than perfect; as, an imperfect fifth. -- Imperfect number (Math.), a number either greater or less than the sum of its several divisors; in the former case, it is called also a defective number; in the latter, an abundant number. -- Imperfect obligations (Law), obligations as of charity or gratitude, which cannot be enforced by law. -- Imperfect power (Math.), a number which can not be produced by taking any whole number or vulgar fraction, as a factor, the number of times indicated by the power; thus, 9 is a perfect square, but an imperfect cube. -- Imperfect tense (Gram.), a tense expressing past time and incomplete action.