Meaning of yàn:
yàn
厌
Verb
(bound form) to loathe; to be fed up with; (literary) to satiate; to satisfy
Tā duì zhè fèn gōngzuò yǐjīng gǎndào fēicháng yànjuàn.
他对这份工作已经感到非常厌倦。
He is already feeling extremely fed up with this job.
Tā duì zhè zhǒng shíwù yǐjīng gǎndào hěn yàn le.
他对这种食物已经感到很厌了。
He is already very satiated with this food.