perilous

As a noun treachery

is deliberate, often calculated, disregard for trust or faith.

As an adjective perilous is

dangerous, full of peril.

As adjectives the difference between obtuse and perilous

is that obtuse is blunt; not sharp while perilous is dangerous, full of peril.

As adjectives the difference between portentous and perilous

is that portentous is of momentous or ominous significance while perilous is dangerous, full of peril.

Perilous is a related term of alarming.

As adjectives the difference between perilous and alarming

is that perilous is dangerous, full of peril while alarming is causing apprehension, fear or alarm; frightening.

As a verb alarming is

.

Serious is a related term of perilous.

As adjectives the difference between serious and perilous

is that serious is without humor or expression of happiness; grave in manner or disposition; earnest; thoughtful; solemn while perilous is dangerous, full of peril.

As an adjective perilous

is dangerous, full of peril.

As a noun jeopardy is

danger of loss, harm, or failure.

As a noun hazard

is (historical) a type of game played with dice.

As a verb hazard

is to expose to chance; to take a risk.

As an adjective perilous is

dangerous, full of peril.

As adjectives the difference between perilous and grievous

is that perilous is dangerous, full of peril while grievous is causing grief, pain or sorrow.

As a noun rebellion

is rebellion (armed resistance).

As an adjective perilous is

dangerous, full of peril.

As an adjective perilous

is dangerous, full of peril.

As a verb dire is

.