Undermanned rhymes with:
reprimand, adarand, ampersand, armband, backhand, badland, bandstand, beckstrand, beforehand, bergland, bergstrand, broadband, businessland, computerland, contraband, cropland, crossland, discland, disneyland, dixieland, dreamland, fairyland, fantasyland, farmhand, farmland, fatherland, ferdinand, finland, firebrand, flatland, forehand, freehand, gondwanaland, grandstand, grassland, handstand, headband, heartland, hellenbrand, hildebrand, hillenbrand, hinterland, homeland, inland, lapland, leibrand, longhand, lowland, lybrand, mainland, marshland, midland, moorland, motherland, musicland, myhand, newsstand, nightstand, northland, nuland, outland, overland, parkland, queensland, quicksand, reprimand, rhineland, samarkand, sealand, seastrand, secondhand, shadowland, shorthand, somaliland, southland, spaceband, spiceland, stagehand, sundstrand, sunland, thailand, timberland, treuhand, wasteland, wetland, wonderland, woodland
Undermanned sounds like:
unadorned, underhanded, undermined, underneath, underwent, undetermined, undreamed, untrained, unturned