obstacle; something immaterial that interferes with or delays action or progress
The bad weather was a hindrance to our travel plans.
Vocabulary like hindrance appears on the Digital SAT in Words-in-Context questions, where you choose the word that fits a passage's meaning and tone. You can also drill this word with vocabulary flashcards.
so; (used to introduce a logical conclusion) from that fact or reason or as a result
unorthodoxy; any opinions or doctrines at variance with the official or orthodox position
isolated; completely sealed; completely airtight
the residence of a recluse; the abode of a hermit
uncertain and slow to act
composed of different elements
suspension; an interruption in the intensity or amount of something
order; a series of ordered groupings within a system