Collocations for ludicrous - adj.

appear, be, look, seem, sound
become

absolutely, completely, just, quite (esp. BrE), simply, totally, utterly (esp. BrE)
The whole idea is absolutely ludicrous!

frankly (BrE)
almost
The plot was so simple, it was almost ludicrous.

faintly (BrE)

Ludicrous is used with these nouns:
situation