Words ending in "-ness"
Here is a list of words using the suffix "-ness", categorized by the type of word they create:
Nouns:
* Abstract Nouns:
* Happiness
* Sadness
* Goodness
* Badness
* Kindness
* Meanness
* Darkness
* Brightness
* Weakness
* Strength
* Stiffness
* Softness
* Roughness
* Smoothness
* Sweetness
* Bitterness
* Sharpness
* Dullness
* Loudness
* Quietness
* Slowness
* Quickness
* Cleanliness
* Dirtiness
* Politeness
* Rudeness
* Fairness
* Unfairness
* Honesty
* Dishonesty
* Bravery
* Cowardice
* Wisdom
* Foolishness
* Cleverness
* Stupidity
* Calmness
* Nervousness
* Excitement
* Boredom
* Loneliness
* Happiness
* Sadness
* Tiredness
* Freshness
* Warmth
* Coldness
* Wetness
* Dryness
* Thickness
* Thinness
* Emptiness
* Fullness
* Darkness
* Lightness
* Closeness
* Distance
* Nearness
* Farneness
* Openness
* Closeness
* Truthfulness
* Falseness
* Seriousness
* Funniness
* Awesomeness
* Weirdness
* Uselessness
* Usefulness
* Importance
* Unimportance
* Uniqueness
* Commonness
* Readiness
* Slowness
* Gentleness
* Wildness
* Chaos
* Orderliness
* Relevance
* Irrelevance
* Craziness
* Sanity
* Simplicity
* Complexity
* Elegance
* Vulnerability
* Resilience
* Fragility
* Robustness
* Flexibility
* Rigidity
* Fluidity
* Viscosity
* Opacity
* Transparency
* Density
* Porosity
* State of Being:
* Sickness
* Illness
* Wellness
* Healthiness
* Awakefulness
* Sleepiness
* Consciousness
* Unconsciousness
* Deadness
* Liveliness
* Brokenness
* Wholeness
* Closeness
* Openness
* Frightenedness
* Calmness
* Other:
* Kindness
* Meanness
* Goodness
* Badness
* Politeness
* Rudeness
* Cleanliness
* Dirtiness
* Loudness
* Quietness
* Swiftness
* Slowness
* Darkness
* Brightness
* Wildness
* Tameness
Adjectives:
* General Adjectives:
* Likeness
* Sameness
* Differentness
* Closeness
* Openness
* Farneness
* Readiness
* Uselessness
* Usefulness
* Importance
* Unimportance
* Uniqueness
* Commonness
* Adjectives Describing Qualities:
* Goodness
* Badness
* Kindness
* Meanness
* Politeness
* Rudeness
* Cleanliness
* Dirtiness
* Loudness
* Quietness
* Swiftness
* Slowness
* Darkness
* Brightness
* Wildness
* Tameness
* Happiness
* Sadness
* Calmness
* Nervousness
* Excitement
* Boredom
* Loneliness
* Tiredness
* Freshness
* Warmth
* Coldness
* Wetness
* Dryness
* Thickness
* Thinness
* Emptiness
* Fullness
* Closeness
* Distance
* Nearness
* Farneness
* Truthfulness
* Falseness
* Seriousness
* Funniness
* Awesomeness
* Weirdness
* Relevance
* Irrelevance
* Craziness
* Sanity
* Simplicity
* Complexity
* Elegance
* Vulnerability
* Resilience
* Fragility
* Robustness
* Flexibility
* Rigidity
* Fluidity
* Viscosity
* Opacity
* Transparency
* Density
* Porosity
Verbs:
* General Verbs:
* likeness (rare)
* sameness (rare)
* differentness (rare)
* closeness (rare)
* openness (rare)
* farneness (rare)
* readiness (rare)
* uselessness (rare)
* usefulness (rare)
* importance (rare)
* unimportance (rare)
* uniqueness (rare)
* commonness (rare)
* Verbs Describing Actions:
* goodness (rare)
* badness (rare)
* kindness (rare)
* meanness (rare)
* politeness (rare)
* rudeness (rare)
* cleanliness (rare)
* dirtiness (rare)
* loudness (rare)
* quietness (rare)
* swiftness (rare)
* slowness (rare)
* darkness (rare)
* brightness (rare)
* wildness (rare)
* tameness (rare)
* happiness (rare)
* sadness (rare)
* calmness (rare)
* nervousness (rare)
* excitement (rare)
* boredom (rare)
* loneliness (rare)
* tiredness (rare)
* freshness (rare)
* warmth (rare)
* coldness (rare)
* wetness (rare)
* dryness (rare)
* thickness (rare)
* thinness (rare)
* emptiness (rare)
* fullness (rare)
* closeness (rare)
* distance (rare)
* nearness (rare)
* farneness (rare)
* truthfulness (rare)
* falseness (rare)
* seriousness (rare)
* funniness (rare)
* awesomeness (rare)
* weirdness (rare)
* relevance (rare)
* irrelevance (rare)
* craziness (rare)
* sanity (rare)
* simplicity (rare)
* complexity (rare)
* elegance (rare)
* vulnerability (rare)
* resilience (rare)
* fragility (rare)
* robustness (rare)
* flexibility (rare)
* rigidity (rare)
* fluidity (rare)
* viscosity (rare)
* opacity (rare)
* transparency (rare)
* density (rare)
* porosity (rare)
This list is by no means exhaustive, but it should provide a good starting point for exploring words using the "-ness" suffix. Remember that many of these words are used only in very specific contexts.