The Collaborative International Dictionary
Flat-footed \Flat"-foot`ed\, a.
Having a flat foot, with little or no arch of the instep; suffering from fallen arches. [WordNet sense 3]
Firm-footed; determined. [Slang, U.S.]
clumsy; amateurish; pedestrian; unimaginative; plodding; as, flatfooted prose.
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Without reservation; without evasion or compromise; firm; as, a flat-footed refusal; a flatfooted denial. [WordNet sense 4]
Syn: downright, forthright, foursquare, head-on, straightforward.
With feet flat on the ground; not tiptoe. [WordNet sense 1]
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Unprepared and unable to react quickly; as, the new product caught their competitors flat-footed. [WordNet sense 2]
Syn: unready.
To catch (one) flatfooted to catch (a person) unprepared; to catch (a person) by surprise.