'Able' in the Bible

Now these are those who came up from Tel-melah, Tel-harsha, Cherub, Addan and Immer, but they were not able to give evidence of their fathers’ households and their descendants, whether they were of Israel:

But there are many people; it is the rainy season and we are not able to stand in the open. Nor can the task be done in one or two days, for we have transgressed greatly in this matter.