i Register
In some senses, obviously is marked as colloquial. Watch for register when choosing this word.
adv
In an obvious or clearly apparent manner.
She was in floods of tears and obviously very upset.
She'd obviously not gone to sleep yet: her eyes were bloodshot with sleepiness.
Used as a filler word, or to introduce information even when not obvious.
You weren't to know, but I've spoken to, obviously, Jim about this, and ...