Collocations for critical - adj.

be | become | remain

bitterly, deeply, extremely, fiercely, harshly, highly, severely, sharply, strongly, very | increasingly | a little, mildly, quite | openly
She became openly critical of party policy.

of
The report was highly critical of the railway''s poor safety record.

be | become

really | absolutely | increasingly

for
Maintaining control of the the budget is absolutely critical for success.

to
This reorganization is critical to the long-term future of the company.