... drab.dingo (singular) dingoes or dingos (plural)dining or dinning?dine + ing = dining (as in dining room)din + ing = dinning (noise dinning in ears)See ADDING ENDINGS (i) and (ii).diphtheria(not ... working properly (aDEFECTIVE machine).DEFICIENT means lacking something vital (a dietDEFICIENT in vitamin C).deferdeferred, deferring, deferenceSee ADDING ENDINGS (iv).deffiniteWrong ... reluctant to participate and isclearly UNINTERESTED in any activities the schoolhas to offer.Originally, DISINTERESTED was used in this sense(= having no interest in, apathetic),...