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 (fôr′mĭ-də-bəl, fôr-mĭd′ə-)
1. Arousing fear, dread, or alarm: the formidable prospect of major surgery.
2. Inspiring awe, admiration, or wonder: "A woman of formidable intelligence and tenacity, [she] prides herself on being independent-minded" (Nan Levinson).
3. Difficult to undertake, surmount, or defeat: a formidable challenge; a formidable opponent.

[Middle English, from Old French, from Latin formīdābilis, from formīdāre, to fear, from formīdō, fear.]

for′mi·da·bil′i·ty, for′mi·da·ble·ness n.
for′mi·da·bly adv.
Usage Note: Traditionally formidable has been pronounced with stress on the first syllable, but recently the pronunciation with stress on the second syllable, which is a common variant in British English, has seen increasing use in American English. However, the traditional pronunciation is still preferred by a large majority of the Usage Panel. In our 2008 survey, 73 percent favored the pronunciation with stress on the first syllable, and 27 percent favored the other pronunciation. Both pronunciations are acceptable, however.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.formidability - impressive difficultyformidability - impressive difficulty    
difficultness, difficulty - the quality of being difficult; "they agreed about the difficulty of the climb"
References in classic literature ?
Imagine, if you can, a bald-faced hornet of your earthly experience grown to the size of a prize Hereford bull, and you will have some faint conception of the ferocious appearance and awesome formidability of the winged monster that bore down upon me.
The Czech critics too commended the consistency of the thematic work, orchestration, the formidability of the structure.
The SCA assures investors about the resilience and formidability of the operation procedures of UAE financial markets, which it said have been formulated according to resolute legislation system through which the SCA accurately and carefully apply the rules and regulations, monitor market practices through direct, regular and surprise inspections or through highly advanced electronic systems.
His decision to pick Vurnon Anita and Papiss Cisse on Saturday was an attempt to get Mike Ashley's last two big-money signings into a cohesive starting XI, but it was only a partial success - and Newcastle are still searching for the fluency and formidability that has typified their European efforts.
Using a sample of Hollywood stars they demonstrated that those actors known for their physical strength and formidability, among them Arnold Schwarzenegger, Bruce Willis, Chuck Norris and Sylvester Stallone, were more likely to support military action.
But as well as new faces among the playing and backroom staff, collectively Villa now also boast a new face of formidability, which on off-days like Saturday could prove to be priceless if they are to avoid being pointless.
The collective impact of the eight weapons reflects the formidability of the group, who in all their contacts seldom miss their targets, Their marksmanship is surely extraordinary.
When Leona had mentioned his mean streak, I'd pictured someone with at least a little formidability.
As has been proven throughout history, and largely is true today, given religion is associated with ethnocentrism and in-group superiority, and intolerance of ambiguity, as well as with dogmatism and rigidity, even with a genuine commitment to ecumenicalism, there are at least four obstacles with varying degrees of formidability.