impugn

v. 指责，对…表示怀疑

impromptu, improper, improper fraction, improperly, impropriety, improve, improve on, improvement, improvidence, improvident, improvidently, improvisation, improvise, improvised, imprudence, imprudent, imprudently, impudence, impudent, impudently, impuissance, impulse, impulse buying, impulsion, impulsive, impulsively, impulsiveness, impunity, impure, impurity, imputation, impute, in, in light of, in (the )future, in a hurry, in a moment, in a sense, in a way, in a word,