In a transient manner; momentarily; briefly.(adverb)
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Use "transiently" in a sentence
"His hand, falling lightly upon the man's shoulder, brought him squarely about, his expression transiently startled, if not a shade truculent."
"They smiled at his name transiently, but in agreement: the tattler-spout of their set was, a fatal person to encounter, and each deemed the sudden apparition of him in the very early morning along the Carlsruhe road rather magical."
"Can we think that he takes a sufficiently discerning and religious view of her office and destiny _ever_ to do her justice, except when prompted by sentiment, -- accidentally or transiently, that is, for the sentiment will vary according to the relations in which he is placed?"