1 very large in size or amount and seeming to have no end:
endless patience * endless opportunities for making money * The possibilities are endless. * an endless list of things to do * We don't have an endless supply of money, you know.
2 continuing for a long time and seeming to have no end:
an endless round of parties and visits * The journey seemed endless. * I've had enough of their endless arguing.
3 (technical) (of a loop, etc.) having the ends joined together so it forms one piece:
an endless loop of tape
endlessly adverb:
She talks endlessly about her problems. * an endlessly repeated pattern
