IPA: /ˈmɑːvələs/
KK: /ˈmɑrvələs/
Causing great wonder or admiration; extremely good or impressive.
The magician's performance was absolutely marvellous, leaving the audience in awe.
Comparative: more marvellous
Superlative: most marvellous
Marvellous → It is formed from 'marvel' (from Old French *merveille*, meaning wonder or amazement) and the suffix '-ous' (meaning full of). The word 'marvellous' means full of wonder or extraordinary.
Think of something that inspires 'wonder' ('marvel') and is 'full of' ('-ous') that feeling — that's why marvellous means something extraordinary.