The Collaborative International Dictionary of English v.0.48:
Stammering \Stam"mer*ing\, a.
   Apt to stammer; hesitating in speech; stuttering. --
   Stam"mer*ing*ly, adv.
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Stammering \Stam"mer*ing\, n. (Physiol.)
   A disturbance in the formation of sounds. It is due
   essentially to long-continued spasmodic contraction of the
   diaphragm, by which expiration is prevented, and hence it may
   be considered as a spasmodic inspiration.
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Stammer \Stam"mer\ (st[a^]m"m[~e]r), v. i. [imp. & p. p.
   Stammered (-m[~e]rd); p. pr. & vb. n. Stammering.] [OE.
   stameren, fr. AS. stamur, stamer, stammering; akin to D. &
   LG. stameren to stammer, G. stammeln, OHG. stammal[=o]n,
   stamm[=e]n, Dan. stamme, Sw. stamma, Icel. stama, stamma,
   OHG. & Dan. stam stammering, Icel. stamr, Goth. stamms, and
   to G. stemmen to bear against, stumm dumb, D. stom. Cf.
   Stem to resist, Stumble.]
   To make involuntary stops in uttering syllables or words; to
   hesitate or falter in speaking; to speak with stops and
   difficulty; to stutter.
   [1913 Webster]
         I would thou couldst stammer, that thou mightest pour
         this concealed man out of thy mouth, as wine comes out
         of a narrow-mouthed bottle, either too much at once, or
         none at all.                             --Shak.
   [1913 Webster]
Moby Thesaurus II by Grady Ward, 1.0:
52 Moby Thesaurus words for "stammering":
   balbutient, balbuties, bashful, bashfulness, battology, confused,
   confusion, conscious, coy, coyness, demure, demureness, demurity,
   dysphemia, embarrassment, expletive, faltering, filling, halting,
   hesitating, hesitation, inarticulate, macrology, mousiness, mousy,
   padding, palilalia, pleonasm, redundancy, self-conscious,
   self-consciousness, shamefaced, shamefacedness, shamefast,
   shamefastness, shy, shyness, skittish, skittishness, stagefright,
   stammer, stumbling, stutter, stuttering, tautologism, tautology,
   timid, timidity, timidness, timorous, timorousness, traulism