asperity, rigor
difficulty, unfortunate situation
problems,difficulty,dilemma
The medical term is dyspnea (difficulty breathing).
stress, strain, load, hardship, difficulty, anxiety
disadvantage, difficulty, handicap, deficiency, flaw, hitch, snag, downside
fear of being closed in; fear of being in room without a door; difficulty breathing if enclosed
Sometimes; It depends on the context. When you use the word "harder" as for difficulty level, then yes, tougher is a synonym for harder. If you are talking about the firmness of an object, tougher is NOT a synonym for harder. Or if you're talking about the chewyness of something.
Synonyms for "problem" include "issue," "challenge," "difficulty," "obstacle," and "dilemma." Each of these terms can convey a sense of a situation that requires a solution or poses a concern. The choice of synonym often depends on the context in which the word is used.
What is synonym for merchant? What is synonym for merchant?
synonymize
What is the synonym government.
you are a synonym of abandoned.