incongruous

Etymology

From Latin incongruus, from in- (“not”) + congruus (“congruent”).

adj

1. Not similar or congruent; not matching or fitting in.
   Ardent suns had likewise tanned his face till it was swarthy as a Spaniard's. The yellow mustache appeared incongruous in the midst of such swarthiness. 1912, Jack London, chapter 1, in A Son Of The Sun
   For a few moments England toyed with the idea of making it a more difficult night than necessary. Scotland had scored a goal that seemed incongruous to the rest of their performance and, briefly, a fiercely partisan crowd sensed an improbable comeback. 18 November 2014, Daniel Taylor, “England and Wayne Rooney see off Scotland in their own back yard”, in The Guardian
2. (mathematics) Of two numbers, with respect to a third, such that their difference can not be divided by it without a remainder.
   20 and 25 are incongruous with respect to 4.