WordNet (r) 3.0 (2006):

good enough
    adj 1: adequately good for the circumstances; "if it's good
           enough for you it's good enough for me"

Moby Thesaurus II by Grady Ward, 1.0:

97 Moby Thesaurus words for "good enough":
   OK, Roger, absolutely, acceptable, adequate, admissible, agreeable,
   all right, alright, alrighty, amen, ample, as you say, assuredly,
   aye, barely sufficient, better than nothing, by all means,
   certainly, commensurate, competent, corresponding, da, decent, due,
   enough, equal to, exactly, fair, fairish, fine, fit, good, goodish,
   hear, indeed, indeedy, ja, just so, mais oui, minimal, minimum,
   moderate, most assuredly, naturally, naturellement, not amiss,
   not bad, not half bad, not so bad, of course, okay, oui, passable,
   plenty, plenty good enough, positively, precisely, presentable,
   pretty good, proportionate, quite, rather, really, respectable,
   right, righto, satisfactory, substantial, sufficient,
   sufficient for, sufficing, suitable, sure, sure thing, surely,
   tenable, tidy, to be sure, tolerable, truly, unexceptionable,
   unobjectionable, up to, very well, viable, well and good, why yes,
   workmanlike, yea, yeah, yep, yes, yes indeed, yes indeedy, yes sir,
   yes sirree