Collocations for dangerous - adj.

be, feel, look, prove, seem, sound
become, get
The situation could get dangerous.

remain
make sth
The ice is making the roads very dangerous tonight.

consider sth, regard sth as
The escapee is not considered dangerous.

extremely, fairly, very, etc.
exceedingly, highly, incredibly, terribly
a highly dangerous situation

increasingly
a little, slightly, etc.
possibly, potentially
downright, positively
It's a risky idea, if not downright dangerous!

inherently
notoriously
This route through the mountains is notoriously dangerous.

politically
Raising income tax is considered politically dangerous.

for
This treatment is extremely dangerous for the mother.

to
not dangerous to humans

Dangerous is used with these nouns:
adventure, animal, assignment, bacteria, bend, business, chemical, combination, complication, condition, consequence, creature, criminal, current, degree, delusion, disease, dog, driver, driving, drug, encounter, enemy, environment, fault, foe, fugitive, gamble, game, glint, ground, habit, illness, illusion, imbalance, job, journey, junction, level, lunatic, manoeuvre, mission, myth, neighbourhood, obsession, occupation, opponent, parasite, pastime, pesticide, place, play, player, precedent, proposition, road, route, side effect, situation, slippery slope, sport, street, stretch, stunt, substance, subversive, task, tendency, territory, thing, threat, trend, waste, water, weapon, work