tired
1 adj If you are tired, you feel that you want to rest or sleep.
Michael is tired and he has to rest after his long trip.
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tiredness n-uncount
He had to cancel some engagements because of tiredness.
2 adj You can describe a part of your body as tired if it looks or feels as if you need to rest it or to sleep.
My arms are tired, and my back is tense.
3 adj If you are tired of something, you do not want it to continue because you are bored of it or unhappy with it.
v-link ADJ of n/-ing
(=sick)
I am tired of all the speculation..., I was tired of being a bookkeeper.
4 adj If you describe something as tired, you are critical of it because you have heard it or seen it many times. usu ADJ n (disapproval)
I didn't want to hear another one of his tired excuses...
dog-tired
If you say that you are dog-tired, you are emphasizing that you are extremely tired.
INFORMAL adj v-link ADJ (emphasis)
By dusk we were dog-tired and heading for home.