ADJ. big, chief, main, major | enormous, formidable, serious The attitude of the unions is a serious obstacle. | impossible, insuperable, insurmountable Lack of money has proved an almost insurmountable obstacle.
VERB + OBSTACLE pose, prove, remain | come across, encounter | overcome, remove, surmount He was determined to overcome all obstacles in his way.
PREP. ~ for Lack of childcare provision can be a major obstacle for women wishing to work. | ~ to The huge distances involved have proved an obstacle to communication between villages.
PHRASES an obstacle in the path/way (of sb/sth) The release of prisoners remains an obstacle in the path of a peace agreement.