dämlich
Translation
stupid, silly, daft, idiotic
Examples
Das war eine dämliche Idee von dir.
That was a stupid idea of yours.
Hör auf mit diesem dämlichen Grinsen!
Stop with that silly grin!
Grammar Patterns
((Adjective)) + Noun (attributive) That was a stupid mistake.
sein + ((Adjective)) (predicative) Don't be so silly!
Similar Words
Synonyms: dumm, blöd, idiotisch; Antonyms: klug, intelligent, schlau
Etymology
Possibly related to 'Dämmerung' (twilight), originally meaning dazed or dizzy, as if in a twilight state.
Memory Tips
It sounds a bit like the English word 'damn'. You might say 'Damn, that was a stupid thing to do!' to link 'dämlich' with 'stupid'.