stale 
/ˈsteɪl/ adjective
stal·er; stal·est /ˈsteɪl/ adjective [more stale; most stale] 1 a of food : no longer good or appealing : no longer fresh
▪ stale food ▪ stale bread
b : not clean, clear, or pure : having an unpleasant taste or smell
▪ stale air/water ▪ a room filled with stale smoke 2 : not interesting or new : boring or unoriginal
▪ stale news/jokes ▪ Their relationship went stale. [=became dull or predictable] 3 : not as strong, effective, or energetic as before
▪ She felt stale [=bored] in her job.
▪ stale food ▪ stale bread
b : not clean, clear, or pure : having an unpleasant taste or smell
▪ stale air/water ▪ a room filled with stale smoke
▪ stale news/jokes ▪ Their relationship went stale. [=became dull or predictable]
▪ She felt stale [=bored] in her job.
