The Collaborative International Dictionary of English v.0.48:

Rambling \Ram"bling\ (r[a^]m"bl[i^]ng), a.
   Roving; wandering; discursive; as, a rambling fellow, talk,
   or building.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ramble \Ram"ble\ (r[a^]m"b'l), v. i. [imp. & p. p. Rambled
   (r[a^]m"b'ld); p. pr. & vb. n. Rambling (r[a^]m"bl[i^]ng).]
   [For rammle, fr. Prov. E. rame to roam. Cf. Roam.]
   1. To walk, ride, or sail, from place to place, without any
      determinate object in view; to roam carelessly or
      irregularly; to rove; to wander; as, to ramble about the
      city; to ramble over the world.
      [1913 Webster]

            He that is at liberty to ramble in perfect darkness,
            what is his liberty better than if driven up and
            down as a bubble by the wind?         --Locke.
      [1913 Webster]

   2. To talk or write in a discursive, aimless way.
      [1913 Webster]

   3. To extend or grow at random. --Thomson.
      [1913 Webster]

   Syn: To rove; roam; wander; range; stroll.
        [1913 Webster]

WordNet (r) 3.0 (2006):

rambling
    adj 1: spreading out in different directions; "sprawling
           handwriting"; "straggling branches"; "straggly hair"
           [syn: sprawling, straggling, rambling, straggly]
    2: (of e.g. speech and writing) tending to depart from the main
       point or cover a wide range of subjects; "amusingly
       digressive with satirical thrusts at women's fashions among
       other things"; "a rambling discursive book"; "his excursive
       remarks"; "a rambling speech about this and that" [syn:
       digressive, discursive, excursive, rambling]
    3: of a path e.g.; "meandering streams"; "rambling forest
       paths"; "the river followed its wandering course"; "a winding
       country road" [syn: meandering(a), rambling,
       wandering(a), winding]

Moby Thesaurus II by Grady Ward, 1.0:

288 Moby Thesaurus words for "rambling":
   Greek to one, Wanderjahr, aberrancy, aberrant, aberration,
   aberrative, adrift, afloat, afoot and lighthearted, aimless,
   aimlessness, alternating, ambagious, ambiguous, amorphous,
   babbling, bend, beyond understanding, bias, branching off, broken,
   bumming, by the way, capricious, careening, catchy, changeable,
   changeful, choppy, circuitous, circuitousness, circumforaneous,
   circumlocutional, circumlocutory, confused, corner, crook, curve,
   declination, delirious, departing, departure, desultoriness,
   desultory, detour, deviable, deviance, deviancy, deviant,
   deviating, deviation, deviative, deviatory, devious, deviousness,
   diffuse, digression, digressive, digressiveness, disconnected,
   discontinuous, discursion, discursive, discursiveness, disjointed,
   disorganized, distracted, distrait, distraught, divagation,
   divagatory, divarication, divergence, diversion, dizzy, dogleg,
   double, drift, drifting, eccentric, endless, episodic, errant,
   errantry, erratic, excursion, excursive, excursus, exorbitation,
   fast and loose, fickle, fitful, flickering, flighty, flitting,
   floating, fluctuating, footloose, footloose and fancy-free,
   frantic, freakish, fugitive, gadding, giddy, guttering, gypsy-like,
   gypsyish, hairpin, halting, herky-jerky, heteroclite, hoboism,
   illogical, immethodical, impenetrable, impetuous, impulsive,
   inarticulate, incognizable, incoherent, incomprehensible,
   inconsistent, inconstant, indecisive, indirect, indirection,
   infirm, inscrutable, interminable, intermittent, intermitting,
   irregular, irresolute, irresponsible, itineracy, itinerancy,
   itinerant, jerky, jumbled, labyrinthine, landloping, lightheaded,
   loose, lurching, maundering, mazy, meandering, mercurial,
   migrational, migratory, moody, muddled, nomad, nomadic, nomadism,
   nonuniform, numinous, obliquity, off, out-of-the-way,
   past comprehension, patchy, peregrination, pererration,
   peripatetic, periphrastic, planetary, prolix, ramble, ranging,
   ranting, raving, restless, roam, roaming, rough, roundabout, rove,
   roving, scatterbrained, scrambled, scrappy, serpentine, shapeless,
   sheer, shift, shifting, shifting course, shifting path, shifty,
   shuffling, skew, slant, snaky, snatchy, spasmatic, spasmic,
   spasmodic, spastic, spineless, sporadic, spotty, sprawling,
   spread out, spreading, staggering, straggling, straggly, stray,
   straying, strolling, sweep, swerve, swerving, swinging, tack,
   tortuous, traipsing, transient, transitory, transmigratory, turn,
   turning, twist, twisting, unaccountable, uncertain, unconnected,
   uncontrolled, undependable, undirected, undisciplined, unequal,
   uneven, unfathomable, unfixed, unintelligible, unknowable,
   unmethodical, unmetrical, unorganized, unplanned, unpredictable,
   unregular, unreliable, unrestrained, unrhythmical, unsearchable,
   unsettled, unstable, unstable as water, unstaid, unsteadfast,
   unsteady, unsystematic, vacillating, vagabond, vagabondage,
   vagabondia, vagabondism, vagrancy, vagrant, variable, variation,
   veer, veering, verbose, vicissitudinary, vicissitudinous, volatile,
   wandering, wanderlust, wanton, warp, wavering, wavery, wavy,
   wayfaring, wayward, whimsical, wild, winding, wishy-washy,
   wobbling, wobbly, wordy, yaw, zigzag