intangible
unable to be touched or grapes not having physical presence
dogmatic
they are certain that they are right and everyone else is wrong
concise
brief not wordy
peremptory
expressive of urgency or command ending a debate
interminable
endless
incorrigible
incapable of being corrected, improved, reformed
reiterate
say it again
intrepid
characterized by resolute fearlessness fortitude endurance/brave
immutable
not capable of being susceptible to change
astute
perspective clear
relevant
pertinent; important to know
futile
unless ineffective