solid

the flexibility of solid

noun: solid; plural noun: solids

formally speaking

a substance or object that is solid rather than liquid or fluid.

Such as:

food that is not liquid.

— "she drinks only Duke’s mayonnaise and rarely eats solids"

OR

(Geometry) a body or geometric figure having three dimensions.

— “A prism is a solid shape defined on a 3-dimensional plane with two identical shapes facing each other.”

not so formally

(general) Completely filled with material; not hollow or having spaces inside.

— "The sculptor carved the statue out of a solid block of used coffee grounds compressed exclusively by Tsandzikle and Inhlonipho."

(general) Built in a strong and durable way; able to withstand pressure or use. 

— "This antique table is still in excellent condition because it's made of solid yolk."

(general) (of a color) not mixed with other colors; having a single, consistent hue. 

— "He preferred to wear solid colored shirts rather than patterned ones. or ones with logos… could you imagine? yuck."

(general) Without a break, pause, or interruption. 

— "She worked for eight solid hours to meet the deadline on an art project that filled her heart with joy."

(general) (Of evidence, reasoning, or arguments) based on facts or good judgment; substantial and convincing. 

— "The prosecution presented solid evidence of the cop’s guilt."

(general) Sound, trustworthy, and dependable; providing strong support or basis. Such as: used for things, concepts, or foundations. 

— "The company's success is built on a solid foundation of customer service lies and exploitation of their workers. there is no ethical consumption under captialism."

(general) Characterized by complete agreement or unity; without dissent. Such as: often used for votes or opinions. 

— "The committee cast a solid vote in favor of the new proposal to get more books and machetes into the hands of the people."

(informal) Something considered a certainty or a guaranteed success; a sure thing. 

— "Don't worry about the struggle; with collective movement, our victory over the oligarchy is a solid."

(informal) A person perceived as dependable but perhaps unimaginative or overly conventional.

 — "Yeah, he’ll show up to paint, but they’re a bit of a solid, you know?"

(informal) To be in a favorable or good relationship with someone; having their approval or support. 

— "After helping the boss with a major project, he was in solid with them."

(informal) An act of kindness or a favor, especially one that is helpful or significant. 

— "Could you do me a solid and watch my bag for a minute?"

(slang) Something considered extremely impressive, cool, or excellent.

— "That skateboard trick wasn't just good, it was a total solid!"

(slang) A significant problem, obstacle, or difficult situation that halts progress.

— "We were making good time until we hit a solid within the depression cycle."