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Longman Dictionary of Contemporary English
trouble-free
adjective
COLLOCATIONS FROM OTHER ENTRIES
pain-free/trouble-free etc
▪ a stress-free life
EXAMPLES FROM CORPUS
▪ And for mums with their hands full, there's a trouble-free container.
▪ At least London's Notting Hill Carnival got off to a trouble-free start.
▪ But police and parade stewards kept the two sides apart and the event was relatively trouble-free.
▪ However, some items make useful additions to any holiday suitcase and will make sure you get the trouble-free break you deserve.
▪ It's usually a trouble-free procedure, but occasionally there's a problem over whether you've really been living apart.
▪ The biggest crisis in her until then trouble-free career came during a recording session in her home town.
▪ Yet if you want to ensure a trouble-free retirement, it's never too early to start financial planning.
Wiktionary
trouble-free

a. without trouble

WordNet
trouble-free

adj. without problems or difficulties; "NASA reported a trouble-free launch"

Usage examples of "trouble-free".

That intervention and occupation forces should not rely on collaborationist domestic minorities to maintain control responded to the awareness from the Balkan experience that such alliances are volatile, and may trigger uncontrollable interethnic conflict antithetical to the objective of a trouble-free occupation.

In the two years since it began operating, Big Lil had been economical compared with smaller generators, magnificently reliable, and trouble-free.

It was the first trouble-free transfer the boy had had at the Sime Center, and for Digen it was both thrilling and satisfying, a vicarious sharing almost as good as having his own transfer.

Brun discovered she had a reputation which had preceded her (how, she couldn't figure out)someone on the Bucclos Success had spread the word that she was a hard worker and trouble-free, so she had offers posted to her mail slot by the time she thought to check it.