difficult, challenging
The word abstruse means difficult to understand. A good sentences would be, the toddler was so abstruse that it made us laugh.
Difficult: more difficult most difficult
Fussy means difficult to please.
The state of being complex; intricacy; entanglement., That which is complex; intricacy; complication.
the scientific word that means difficult swallowing is " Dysphagia " ..
'Intractable' means difficult to manipulate, or hard to manage.
Aphasia
Ornery.
The word uneasy means not easy. The word easy means not hard.
Hamper
not often means seldom
Endure is the word. It means suffer (something painful or difficult) patiently.
Resolve means to work out a problem.
Crackjaw means a word or a phrase that is difficult to pronounce.
The word "ergonomics" is derived from two Greek words: "ergon" meaning work and "nomos" meaning laws. Thus, ergonomics refers to the study of designing a work environment that best fits the capabilities and limitations of individuals to optimize their efficiency and well-being.
As a noun, the word trabajador means worker, it comes from trabajar which is to work. As an adjective, it means hardworking.