Idiotic (adjective)

Stupid, foolish, or lacking good sense or judgement.

Origin:

The term 'idiotic' originated in the 16th century and is derived from the greek word 'idiotes' meaning 'private person' or 'layman'.

Examples:

1. His decision to jump off the roof was idiotic and he was lucky to survive with only minor injuries.
2. Her excuse for not studying was idiotic and it was clear that she wasn't taking the exam seriously.
3. The idiotic behavior of the driver caused a pile-up on the highway.
4. His comments were so idiotic that they couldn't be taken seriously.
5. The idiotic idea to rob the bank was quickly dismissed by the rest of the group.