Collocations with keen

keen adjective 

ADVERBS

really, very, so, desperately, extremely, especially, particularly
・They were very keen to explore new opportunities.
・He's desperately keen on pursuing a career in medicine.

highly, intensely, deeply, overly 
・She was deeply keen to understand the cultural differences.

frightfully, awfully, terribly, more than
・The students were more than keen to participate in the science fair.

exceptionally, passionately, incredibly, remarkably 
・The team was exceptionally keen to win the championship.

not at all, not exactly, not that, not overly, not too 
・He's not at all keen on attending the meeting.

fairly, pretty, quite, rather
・She's quite keen to learn how to play the piano.

naturally, understandably 
・Maria is naturally keen on experimenting with new recipes

always • obviously 
・He's always keen to help out with community projects.

VERBS

be, feel • remain  
・She is keen to start her new job and make a good impression.

look, seem, sound, appear
・They look keen to participate in the upcoming competition.

NOUNS

reader, collector, sportsman, gardener, photographer
・John is a keen sportsman who enjoys playing soccer on weekends.

supporter, advocate 
・She's a keen supporter of environmental causes.

volunteer, participant
・Many people are keen volunteers for local charities.

desire 
・There was a keen desire among the students to participate.

interest
・He showed a keen interest in learning about new marketing strategies.

PREPOSITIONS

for 
・The students were keen for information about their upcoming field trip.

on 
・She is keen on the idea of starting her own business.

PHRASES

as keen as mustard
・She's as keen as mustard to start her new job.

mad keen (on)
・He's mad keen on basketball and never misses a game.