Adverb
In an inexpressible manner or degree; unspeakably; unutterably.
Source: Webster's dictionaryA slight sound at evening lifts me up by the ears, and makes life seem inexpressibly serene and grand. It may be Uranus, or it may be in the shutter. Henry David Thoreau
Such a life, with all vision limited to a Point, and all motion to a Straight Line, seemed to me inexpressibly dreary; and I was surprised to note the vivacity and cheerfulness of the King. Edwin Abbott Abbott
When asked to make the formal declaration that I did not intend to overthrow the Constitution of the United States, I was fool enough to reply that I had no such purpose, but that were I to do it by mistake I should be inexpressibly contrite. Peter Medawar
The difference between what the most and the least learned people know is inexpressibly trivial in relation to that which is unknown. Albert Einstein
There is something inexpressibly sad in the thought of the children who crossed the ocean with the Pilgrims and the fathers of Jamestown, New Amsterdam, and Boston, and the infancy of those born in the first years of colonial life in this strange new world. Alice Morse Earle
she was looking very young tonight, and, as usual, indescribably beautiful, in a simple strapless dress of a green and white silky cotton Source: Internet