nimble
moving quickly and lightly
scurry
to move about or proceed hurriedly
totter
move without being stable, as if threatening to fall
resent
feel bitter or indignant about
acquaint
cause to come to know personally
strenuous
taxing to the utmost; testing powers of endurance
absurd
inconsistent with reason or logic or common sense
concise
expressing much in few words
exclusion
a deliberate act of omission
liberate
grant freedom to; free from confinement
casualty
someone injured or killed in an accident
obstacle
something immaterial that stands in the way and must be circumvented or surmounted