English: carelessly, uncaringly, callous
Source: Peter Martin's Kelabit Dictionary
berut: rough, bullying behaviour
gerut: hard rice that sticks to the bottom of the pot after cooking
merut: 1) (m- prefix (Stative verb or adjective)) easily angered; 2) (noun) massage
ngerut (ng-gerut): to scrape out hard rice with a `gayut'
terutung: common, large porcupine