Adjective
1. tiresomely long; seemingly without end;
"endless debates""an endless conversation""the wait seemed eternal""eternal quarreling""an interminable sermon"2. infinitely great in number;
"endless waves"3. having no known beginning and presumably no end;
"the dateless rise and fall of the tides""time is endless""sempiternal truth"4. having the ends united so as to form a continuous whole;
"an endless chain"5. occurring so frequently as to seem ceaseless or uninterrupted;
"a child's incessant questions""your perpetual (or continual) complaints"