utmost
(greatest, highest)
- We should treat old people with utmost respect and care.
- The safety of our staff has always been of utmost importance.
(greatest effort; best)
- We will do our utmost to finish the job on time.
- Mike did his utmost to achieve his goal in life.
upmost
(uppermost, topmost)
- We live on the upmost floor of the building.
- I couldn’t reach the oranges on the upmost branches.