The phrase "insecure jobs" refers to work that is uncertain or unstable. It means that people in these jobs may have a higher risk of losing their employment or having inconsistent income. Full definition
We know how the business works, how the cash flow works, and other elements that make a seemingly insecure job very secure. (deanwesleysmith.com)
David Miliband has been applauded by sections of the liberal press — most notably Martin Kettle in The Guardian — essentially for acknowledging the bleeding obvious; that the parties of the European Left are losing three main groups of voters; working class voters in insecure jobs who are fearful of migrant labour; middle income voters, who are scared of losing their standard of living, and younger middle class graduates who are alienated by the compromises of power. (leftfutures.org)
These «flew poor» had always had insecure jobs as waiters, gardeners, maintenance men, nonunionized factory hands, assistant mechanics, assistant carpenters, assistant electricians — and other assistants. (religion-online.org)