Context Clue
quietly, privately, tactfully
discreetly
unimaginable, unthinkable
inconceivable
guesswork, inference, speculation
conjecture
offended, insulted
indignant
describes someone who is determined, persistent
diligent
figure out, determine
ascertain
astonishment, disbelief
incredulity
gather, collect, save
amass
consider, think about
contemplate
unbelief, amazement
incredulity