tired的名词形式是tiredness.

tiredness：n.疲劳;疲倦;疲惫;劳累.

相关介绍

His face was etched with tiredness.

从他的脸上可以看出他疲惫不堪。

An increasing ratio of mistakes, perhaps induced by tiredness, crept into her game.

可能是由于体力不支，她在比赛中的失误越来越多。

Tiredness and fever are much more likely to be a sign of flu coming on.

疲倦、发烧更有可能是患流感的征兆。