operational researches (noun) operations research: business management study
Sinonime: careless,
demanding,
dissatisfied, faultfinding,
forgetful, grasping, grumbling, heedless, ingrate, insensible,
oblivious, self-centered,
selfish, thankless, unappreciative, unmindful,
unnatural, unthankful
Antonime: appreciative,
grateful,
thankful