adj.暗中进行的；鬼鬼祟祟的；保密的
His surreptitious behaviour naturally aroused suspicion. 他那鬼鬼祟祟的行为自然引起了旁人的怀疑。
He was surreptitious in his movements. 他行踪诡秘。
adv.偷偷摸摸地；暗中地
