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v. stum·bled, stum·bling, stum·bles
a. To miss one's step in walking or running; trip and almost fall.
b. To proceed unsteadily or falteringly; flounder. See Synonyms at blunder.
c. To act or speak falteringly or clumsily: an inexperienced actor stumbling through his lines.
2. To make a mistake or mistakes; blunder: The administration stumbled badly on foreign policy.
3. To come upon accidentally or unexpectedly: "The urge to wider voyages ... caused men to stumble upon New America" (Kenneth Cragg).
To cause to stumble.
1. The act of stumbling.
2. A mistake or blunder.

[Middle English stumblen, probably of Scandinavian origin; akin to Old Norse stumra.]

stum′bler n.
stum′bling·ly adv.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.stumbler - a walker or runner who trips and almost fallsstumbler - a walker or runner who trips and almost falls
pedestrian, footer, walker - a person who travels by foot
2.stumbler - someone who makes mistakes because of incompetencestumbler - someone who makes mistakes because of incompetence
incompetent, incompetent person - someone who is not competent to take effective action
References in classic literature ?
The middle-aged, who have lived through their strongest emotions, but are yet in the time when memory is still half passionate and not merely contemplative, should surely be a sort of natural priesthood, whom life has disciplined and consecrated to be the refuge and rescue of early stumblers and victims of self-despair.
The third stumbler is child spoilage as discussed by Baruti (2010, 247-257).
And that is certainly the case in this superb spy novel which follows the excellent Milo Weaver trilogy which ended with "The Tourist." This story begins in Virginia, at CIA headquarters, where a Libyan-American analyst convinces himself that an old plan, called Stumbler, which he had devised years before, but was shelved, to overthrow the dictator, Muammar Gadhafi, was apparently being implemented.
Net Stumbler, Mini Stumbler, In SSIDer, Kismet, Kis MAC, I-Stumbler, Wifi explorer, Wifi Hopper, Retina WiFi Scanner, Wireless Mon, Wireless NetView, Wireless Network Watcher, Xirrus-Wi-Fi-monitor, OutSSIDer, Wireless Scanner, WiFi Channel Scanner, WiFi Hotspot Scanner, Portable WiFi Network Monitor, WiFi Guard, Wave Stumbler, SSID Sniff for Linux, Wi-Finder, WiFi Stumbler, Wellenreiter wireless penetration tool.
We used Wi-Fi Stumbler, a free web based utility to determine which channel in the area was the least congested.
Each page that you stumble upon has a link to the Stumbler who discovered it.
El registro de las mediciones se llevo a cabo mediante la utilizacion de la herramienta computacional de "codigo abierto" Network Stumbler (Metageek, 2010), tomando muestras cada 15 segundos.
Mr Pearson said: "She was not a stumbler. She wasn't that type of person."