The Collaborative International Dictionary of English v.0.48:

Patchy \Patch"y\, a.
   Full of, or covered with, patches; abounding in patches.
   [1913 Webster]

WordNet (r) 3.0 (2006):

patchy
    adj 1: irregular or uneven in quality, texture, etc.; "a patchy
           essay"; "patchy fog"

Moby Thesaurus II by Grady Ward, 1.0:

211 Moby Thesaurus words for "patchy":
   adulterated, amalgamated, ambiguous, ambivalent, amphibious,
   arrested, bespangled, blemished, blended, blotched, blotchy,
   broken, broken off, callow, capricious, careening, catchy,
   chopped-off, choppy, combined, complex, composite, compound,
   compounded, conglomerate, damaged, dappled, decousu, defective,
   deficient, desultory, deviative, disconnected, discontinued,
   discontinuous, discrete, disjunctive, dotted, dotty, dowdy,
   down-at-heel, down-at-the-heels, eccentric, eclectic, embryonic,
   episodic, equivocal, erratic, erroneous, failing, fallible, faulty,
   fifty-fifty, fitful, flea-bitten, flecked, fleckered, flickering,
   fluctuating, found wanting, frayed, frazzled, frecked, freckled,
   freckly, full of holes, guttering, half-and-half, halting,
   herky-jerky, heteroclite, heterogeneous, holey, hypoplastic,
   immature, immethodical, impaired, imperfect, imprecise, impure,
   in arrear, in arrears, in default, in rags, in short supply,
   in shreds, in tatters, inaccurate, inadequate, incoherent,
   incomplete, inconstant, indiscriminate, inexact, infant,
   intermittent, intermitting, interrupted, intricate, ironic,
   irregular, jagged, jerky, jumbled, lacking, lurching, macular,
   maculate, maculated, makeshift, many-sided, mediocre, medley,
   mingled, miscellaneous, missing, mixed, motley, multifaceted,
   multinational, multiracial, needing, noncontinuous, nonlinear,
   nonsequential, nonserial, nonuniform, not perfect, off,
   parenthetic, part, partial, peppered, pluralistic, pocked,
   pockmarked, pocky, pointille, pointillistic, polka-dot,
   promiscuous, punctated, ragged, raggedy, rambling, ratty, rough,
   scant, scanty, scrambled, scrappy, scruffy, seedy, shabby, shoddy,
   short, shy, sketchy, snatchy, spangled, spasmatic, spasmic,
   spasmodic, spastic, specked, speckled, speckledy, speckly,
   splotched, splotchy, sporadic, spotted, spotty, sprinkled,
   staggering, stippled, studded, suspended, syncretic, tacky,
   tattered, tatty, thrown together, torn, uncertain, unconnected,
   underdeveloped, undeveloped, unequal, uneven, unfinished, unjoined,
   unmethodical, unmetrical, unperfected, unregular, unrhythmical,
   unsettled, unsound, unsteady, unsuccessive, unsystematic,
   unthorough, variable, varied, veering, wandering, wanting,
   wavering, wobbling, wobbly



The Free On-line Dictionary of Computing (30 December 2018):

PATCHY

   A Fortran code management program written at CERN.