life-changing

US /ˈlaɪfˌtʃeɪn.dʒɪŋ/
UK /ˈlaɪfˌtʃeɪn.dʒɪŋ/
"life-changing" picture
1.

having such a profound effect on a person's life that it changes their character or destiny

:
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Meeting her was a truly life-changing experience.
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Winning the lottery was a life-changing event for them.
:
transformativepivotalmomentousrevolutionaryimpactful
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changelifeclimate changegear changechange overchange downchange around