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"This little fluffy-looking character [a tree creeper] moves upwards on the tree in a jerky, furtive way in a similar way to that of a mouse on the ground. This style of movement gave rise to its common name of 'tree mouse' in parts of the UK." — The Southern Star (Ireland), 3 Mar. 2022

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Furtive comes from either Latin furtivus or French furtif. The earliest known written uses of furtive are from the early 1600s. When first used in English, furtive meant "done by stealth," and later also came to mean, less commonly, "stolen." Whichever meaning you choose, the word has an elusive ancestry, which is particularly fitting, since a thief must be furtive to avoid getting caught in the act.