by default
In absence of any opposing action.
If we don't do something, they'll win by default.
No one could think of a better name, so we chose "Strawman" by default.
If he wins an election, it will only be by default.
By default these are clocked at 1.4 or 2.0Ghz respectively. Source: Internet
By default, comments will be allowed on all video uploads you make. Source: Internet
By default, you won’t find it listed on the Start Menu. Source: Internet