Defn: To disapprove of; to disallow. [Obs.]

IMPROBATION
Im`pro*ba"tion, n. Etym: [L. improbatio.]

1. The act of disapproving; disapprobation.

2. (Scots Law)

Defn: The act by which falsehood and forgery are proved; an action brought for the purpose of having some instrument declared false or forged. Bell.

IMPROBATIVE; IMPROBATORY
Im"pro*ba*tive, Im"pro*ba`to*ry, a.

Defn: Implying, or tending to, improbation.

IMPROBITY Im*prob"i*ty, n. Etym: [L. improbitas; pref. im- not + probitas probity: cf. F. improbité.]

Defn: Lack of probity; want of integrity or rectitude; dishonesty.
Persons . . . cast out for notorious improbity. Hooker.

IMPROFICIENCE; IMPROFICIENCY
Im`pro*fi"cience, Im`pro*fi"cien*cy, n.