ridiculous
adjective /rɪˈdɪkjələs/
  /rɪˈdɪkjələs/
(also also informal ridic 
Idioms  /rɪˈdɪk/
  /rɪˈdɪk/
)- very silly or unreasonable synonym absurd, ludicrous
- I look ridiculous in this hat.
 - Don't be ridiculous! You can't pay £50 for a T-shirt!
 - It was ridiculous that this should be so difficult to say.
 - They ate and drank a ridiculous amount.
 
Extra Examples- The whole idea was patently ridiculous.
 - The whole situation appealed to her sense of the ridiculous.
 - This is getting ridiculous!
 - Don't be so ridiculous!
 - It's ridiculous to suggest that she was involved in anything illegal.
 - That's the most ridiculous thing I've ever heard.
 
Oxford Collocations Dictionaryverbs- be
 - feel
 - look
 - …
 
- really
 - absolutely
 - completely
 - …
 
- a sense of the ridiculous
 
Word Originmid 16th cent.: from Latin ridiculosus, from ridiculus ‘laughable’, from ridere ‘to laugh’. 
Idioms 
from the sublime to the ridiculous 
- used to describe a situation in which something serious, important or of high quality is followed by something silly, unimportant or of poor quality