cohesive

The adjective ‘cohesive’ describes a particular quality of physical matter, such as soil, which has the ability to stick together.

As is often the case in English, the physical quality is turned into a metaphor for a group, a society or an organisation which sticks together in varying circumstances.

And, of course, ‘cohesive’ is manifested in the common phrase: ‘Birds of a feather stick together!’ Be aware that this phrase can be variously interpreted as a positive, neutral or negative event.

Therefore, make sure that you apply it appropriately to individual contexts.