To its primitive, diseased brain I was practically invisible, an obstacle to be ignored, and, at best, avoided.
One obstacle: The Ambassador Bridge is privately owned by an American billionaire, Manuel Moroun.
The obstacle though is that any reduction in interest rates would need to be paid for.
mid-14c., from Old French obstacle, ostacle "opposition, obstruction, hindrance" (13c.) or directly from Latin obstaculum "a hindrance, obstacle," with instrumental suffix *-tlom + obstare "stand before, stand opposite to, block, hinder, thwart," from ob "against" (see ob-) + stare "to stand," from PIE root *sta- "to stand" (see stet).
The lover thinks more often of reaching his mistress than the husband of guarding his wife; the prisoner thinks more often of escaping than the gaoler of shutting his door; and so, whatever the obstacles may be, the lover and the prisoner ought to succeed. [Stendhal, "Charterhouse of Parma"]Obstacle course is attested from 1891.