1. Lack of skill, competence, or ability to do something; incompetence
His ineptitude in the kitchen resulted in burnt dinner.
Sua ineptidão na cozinha resultou em jantar queimado.
2. Unsuitability or inappropriateness for a particular purpose or situation
The ineptitude of his comments showed he didn't understand the topic.
A ineptidão de seus comentários mostrou que ele não entendia o assunto.