
Word families (Nouns, Verbs, Adjectives, Adverbs): question, questioning, questioner, questionnaire, question, questionable, unquestionable, unquestionably
Xem thêm: refutable, confutable, confutative
questionable adj.
VERBS be | become | remain
ADV. highly, very Their motives for undertaking this study are highly questionable. | rather, somewhat
adj.
questionable motives
a questionable reputation
a fire of questionable origin