grey adj.
1 of the colour between black and white
ADV. very The sky looks very grey. I think it's going to rain. | quite, rather, slightly
ADJ. dark | light, pale a light grey suit | silvery, slate > Special page at COLOUR
2 with grey hair
VERBS be | go, turn He went grey before he was forty.
ADV. very | completely She was completely grey by the age of thirty.
You can also check other dicts: grey (English, 中文解释 ), wordnet sense, Collins Definition