critical/ 'krɪtɪkl /

1.adjective
(crucial) 关键的

2.adjective
(serious) 危急的

3.adjective
(seriously ill) 病危的

4.adjective [+person] [ remark] 
(negative) 吹毛求疵的

5.adjective [+examination] [ analysis] [ study etc] 
(analytical) 一丝不苟的

6.adjective [+acclaim] [ success] 
(from critics) 评论的

in a critical condition
情况危急
to be critical of sb/sth
批评某人/某事