rather

adverb:to a certain extent; fairly or moderately
- The test was rather difficult.
adverb:used to indicate a preference or to introduce a more desirable alternative
- I would rather stay home than go to the party.
adverb:on the contrary, used to negate and replace a preceding statement
- I didn't find the film boring; rather, it was surprisingly engaging.
adverb:used to introduce a correction or more accurate statement
- He arrived on Tuesday, or rather early Wednesday morning.