seriously
adverb
ˈsɪəriəsli 
ˈsɪriəsli 
1 in a serious wayto be seriously ill/injuredYou're not seriously expecting me to believe that?They are seriously concerned about security.Smoking can seriously damage your health.2 used at the beginning of a sentence to show a change from joking to being more seriousSeriously though, it could be really dangerous.3 (informal) very; extremelyThey're seriously rich.Idioms
take somebody/something seriously
to think that somebody/something is important and deserves your attention and respect
We take threats of this kind very seriously.Why can't you ever take anything seriously?Headaches in young children should always be taken seriously.You can't take anything she says very seriously.