Portuguese-English translations for casual

casualThey only had casual meetingsThe purchase of donuts was just a casual expenseHe was just a casual worker
arbitrary
us
Benjamin Franklins designation of "positive" and "negative" to different charges was arbitraryThe decision to use 18 years as the legal age of adulthood was arbitrary, as both age 17 and 19 were reasonable alternativesThe equation is true for an arbitrary value of x

chance
uk
us
Two unusual things that will hopefully not be left to some chance majority. Trata-se de dois assuntos muito especiais que não poderão ficar à mercê de uma maioria casual qualquer.We had the chance to meet the president last weekWhy leave it to chance when a few simple steps will secure the desired outcome?
random
us
In any case, the decision to evict them is not a random act. De qualquer modo, a decisão de expulsar estas organizações não é um acto casual. The party was boring. It was full of randomsThe flip of a fair coin is purely random.