The word "obstructivenesses" refers to the act or state of obstructing, hindering, or impeding something. The antonyms for this word could be facilitation, assistance, and aid. Facilitation is the act of making a process or task easier or less difficult, while assistance is the act of helping or supporting someone in need. Aid, on the other hand, refers to the provision of resources or support to aid or supplement someone's efforts. Therefore, when there is a lack of obstructivenesses, there is facilitation, assistance, and aid, which can make tasks or processes much more manageable and successful.