From <span class="searchmatch">discomposing</span> + -ly. <span class="searchmatch">discomposingly</span> (comparative more <span class="searchmatch">discomposingly</span>, superlative most <span class="searchmatch">discomposingly</span>) So as to discompose....
1917, Various, Punch, or the London Charivari, Vol. 152. January 17, 1917[3]: The news has had a decidedly discomposing effect already. <span class="searchmatch">discomposingly</span>...