To start
Commence
allowable
Permissible
Daringly, often recklessly adventurous
Audacious
Possessing a friendly manner or temperament
Genial
Concerted
Watch kept while other are normally sleeping
Vigil
To reduce or damage in quality or worth
Deteriorate
Incapable of change
Invariable
choice of one of two options
Alternative
To lure or entice by deception
Decoy
Not aggravating but not interesting
Bland
exceptionally steep
Precipitous
To judge or conclude based on guesswork
Conjecture
Persistent in harshness or severity
Relentless
Facial expression
Countenance
watchful for danger or error
Vigilant
Bottomless pit
Abyss
To keep something desirable visible but out of reach
Tantalize
To originate or send out from a source
Emanate
To firmly plant or establish
Engraft