telltale

1. ADJ Something that is described as telltale gives away information, often about something bad that would otherwise not be noticed. 泄露內(nèi)情的[ADJ n]

Only occasionally did the telltale redness around his eyes betray the fatigue he was suffering. 衹有在他眼周發(fā)紅的時(shí)候才偶爾顯出他有多麼疲勞。