Collocations for endless - adj.

be, seem
The long walk back seemed endless.

almost, nearly (esp. AmE)
practically, virtually
apparently, seemingly
a seemingly endless list of repairs to be carried out

potentially
a potentially endless sequence of repeated shapes

Endless is used with these nouns:
array, barrage, chatter, conversation, corridor, cycle, debate, energy, expanse, fascination, flow, list, litigation, loop, meeting, ocean, patience, pleasure, possibility, procession, pursuit, quest, queue, repetition, replay, round, row, sea, series, speculation, stream, struggle, succession, suffering, supply, toil, trouble, variation, variety, void, wait, whirl