Adverb
In an invisible manner.
Source: Webster's dictionaryWe should never forget that our guardian angel is always invisibly beside us; he guards us and he protects us. But it is necessary that we are also careful in our lives and that we not sin. Paisios of Mount Athos
Surely all God's people, however serious and savage, great or small, like to play. Whales and elephants, dancing, humming gnats, and invisibly small mischievous microbes, - all are warm with divine radium and must have lots of fun in them. John Muir
If the principle is, "Let's not get lethal substances out to the public", the first one you'd go after is tobacco. The next one you'd go after is alcohol. Way down the list you'd get to cocaine, and sort of invisibly low you'd get to marijuana. Noam Chomsky
How should I avoid to be her slave, Whose subtle art invisibly can wreath My fetters of the very air I breath? Andrew Marvell
She came naturally by her confused and groundless fears, for her own mother lived the latter years of her life in the horrible suspicion that electricity was dripping invisibly all over the house. James Thurber
I loved you because there was no other place for me to go. We were married because we did not know what else to do with each other. You never knew me, nothing about me, what died inside me, what lived invisibly. Aleksandar Hemon