interminable
Seeming to last forever and feel like it never ends.
Interminable means seeming to last forever, going on and on without any end in sight. When something is interminable, it feels endless even if it technically does have an endpoint.
A boring lecture can feel interminable when the speaker drones on while you watch the clock, each minute crawling by. A long car trip becomes interminable when you're stuck in the backseat asking “Are we there yet?” for what feels like the hundredth time. Your little brother's interminable story about his video game might make you wonder if he'll ever get to the point.
Interminable things feel like they might never stop, stretching time itself and making every second feel like an eternity. A five-minute wait for the bus isn't interminable, but standing in the rain for what feels like an hour while bus after bus passes by might be.
You'll often see interminable paired with words like “wait,” “meeting,” “speech,” or “delay.” When something is interminable, time itself seems to slow down, making every second feel like an eternity.