obstacle

As an adjective stubborn

is refusing to move or to change one's opinion; obstinate; firmly resisting.

As a noun obstacle is

something that impedes, stands in the way of, or holds up progress.

As nouns the difference between obstacle and complication

is that obstacle is something that impedes, stands in the way of, or holds up progress while complication is the act or process of complicating; the state of being complicated; intricate or confused relation of parts; entanglement; complexity.

As nouns the difference between puzzle and obstacle

is that puzzle is puzzle while obstacle is something that impedes, stands in the way of, or holds up progress.

As nouns the difference between obstacle and issue

is that obstacle is something that impedes, stands in the way of, or holds up progress while issue is the act of passing or flowing out; a moving out from any enclosed place; egress; as, the issue of water from a pipe, of blood from a wound, of air from a bellows, of people from a house.

As a verb issue is

to pass or flow out; to run out, as from any enclosed place.

As nouns the difference between obstacle and malfunction

is that obstacle is something that impedes, stands in the way of, or holds up progress while malfunction is faulty functioning.

As a verb malfunction is

to function improperly.

Obstacle is a related term of perplexity.

As nouns the difference between obstacle and perplexity

is that obstacle is something that impedes, stands in the way of, or holds up progress while perplexity is the state or quality of being perplexed; puzzled or confused.

Obstacle is a related term of exigency.

As nouns the difference between obstacle and exigency

is that obstacle is something that impedes, stands in the way of, or holds up progress while exigency is the demands or requirements of a situation (usually plural ).

As nouns the difference between difficulties and obstacle

is that difficulties is while obstacle is something that impedes, stands in the way of, or holds up progress.

As nouns the difference between climax and obstacle

is that climax is climax while obstacle is something that impedes, stands in the way of, or holds up progress.

As nouns the difference between obstacle and disability

is that obstacle is something that impedes, stands in the way of, or holds up progress while disability is state of being disabled; deprivation or want of ability; absence of competent physical, intellectual, or moral power, means, fitness, and the like.