IPA: /ʌnˈrɪli/
KK: /ʌnˈrɪli/
In a way that is not real or does not seem real.
The dream felt unreally vivid, as if I were actually there.
'un-' (meaning not) and 'really' (from Old French 'reel', meaning actual or true). The word 'unreally' means not actual or not true, describing something that lacks reality or authenticity.
Think of 'not' ('un-') combined with 'true' ('really') to remember that 'unreally' refers to something that is not true or lacks authenticity.