English: opposites: aptitude and ineptitude

Tutoring English, word curiosities are always interesting. The tutor mentions a pair of opposites.

Aptitude means ability even without training, whereas ineptitude suggests scarcity of ability even past lack of training. The words are close to opposite, if not actually. Yet, their spellings don’t quite match. They’re a curious pair.

Source:

Gilmour, Lorna et al. Collins Essential Canadian English Dictionary and Thesaurus. Glasgow: HarperCollins, 2006.