From The Collaborative International Dictionary of English v.0.48 [gcide]:
Dissimilar \Dis*sim"i*lar\, a. [Pref. dis- + similar: cf. F.
dissimilaire.]
Not similar; unlike; heterogeneous; as, the tempers of men
are as dissimilar as their features.
[1913 Webster]
This part very dissimilar to any other. --Boyle.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
dissimilar
adj 1: not similar; "a group of very dissimilar people"; "a pump
not dissimilar to those once found on every farm"; "their
understanding of the world is not so dissimilar from our
own"; "took different (or dissimilar) approaches to the
problem" [ant: similar]
2: not alike or similar; "as unalike as two people could be"
[syn: unalike, dissimilar] [ant: {alike(p)}, like,
similar]
3: marked by dissimilarity; "for twins they are very unlike";
"people are profoundly different" [syn: unlike,
dissimilar, different] [ant: like, similar]