adjective
fantastic, fabulous
A2
fantastisch: an adjective meaning 'fantastic' or 'fabulous' and sometimes 'wonderful'. It is gradable (comparative fantastischer, superlative am fantastischsten) and not a participle. Opposite furchtbar. Used attributively and predicatively like 'eine fantastische Idee' or 'das ist fantastisch'. No irregularities in comparison.
Examples
Die Sängerin klang fantastisch, obwohl sie vor dem Auftritt kaum schlief.
The singer sounded fantastic, although she had barely slept before the performance.
Das Konzert war fantastisch.
The concert was fantastic.
Sie hat eine fantastische Stimme.
She has a fabulous voice.
Details
Mnemonics
Picture fireworks and a banner 'fantastisch!'
sounds like English 'fantastic'
Notes
Positive evaluative adjective; common in spoken German.