His tactless words had incurred his father’s deep displeasure.

不得体话语亲感到十分不快。

She is well-intentioned, but her tactless manner tends to get people's backs up.

她倒是一片好心, 但方法不当容易人生气。

I was rather tactless me to ask such a question.

我竟问出这么个问题，实在是少了个心眼。