Difficult to understand or solve:
(Chemistry) Resistant to biodegradation:
Marked by resoluteness or determination; firm:
Having much weight; very heavy; ponderous
Extremely difficult to perform or endure; trying:
Hard to endure; oppressive; burdensome; distressing
Rigidly interpreted; exactly limited; confined; restricted.
Hard; severe; unyielding; strict
Disagreeable to the sense of sight:
Hard to handle, treat, or deal with; intractable
Able to withstand difficult or adverse conditions; robust:
Clear and distinct to the eye; conspicuous:
Extremely powerful or destructive:
Based on valid reasoning; having no logical flaws:
Hard to penetrate; thick:
Acting together; unanimous:
Having might; powerful; strong
Unwavering, as in purpose; steadfast.
(Informal) Hard to believe because exaggerated or untrue
Readily noticeable; remarkable:
Thick or strong in structure or substance; solid or substantial:
Inclined to wobble; shaky
Unable to withstand temptation, urgency, persuasion, etc.; easily impressed, moved, or overcome; accessible; vulnerable.
Kind and considerate
The definition of kind is warm, generous or sympathetic.
Inviting, characteristic of friendliness.
Easy to understand, do, or carry out:
(Phonet.) Designating c sounded as in voice or g sounded as in age
Easily broken or shattered because hard and inflexible
Indicative of sound, rational thinking or frame of mind:
Powerfully impressive; stark:
Find another word for toughest. In this page you can discover 39 synonyms, antonyms, idiomatic expressions, and related words for toughest, like: knottiest, hardest, sturdiest, worst, weightiest, severest, roughest, heaviest, strictest, sternest and harshest.