From WordNet (r) 3.0 (2006) :
uninflected
adj 1: (of the voice) not inflected; "uninflected words";
"monotonic uninflected speech" [ant: inflected]
2: not inflected; "`boy' and `swim' are uninflected English
words" [ant: inflected]
3: expressing a grammatical category by using two or more words
rather than inflection [syn: analytic, uninflected] [ant:
synthetic]