Durable, rigid (material state)
Fixed (in opinion).
Insistent upon something, not accepting dissent.
Steadfast, secure, solid (in position)
A criminal gang, especially based around football hooliganism.
A business partnership; the name under which it trades.
A business enterprise, however organized.
To become firm; stabilise.
To make firm or strong; fix securely.
To improve after decline.
To make compact or resistant to pressure; solidify.
To shorten (of betting odds).
To select (a higher education institution) as one's preferred choice, so as to enrol automatically if one's grades match the conditional offer.
Easy to deal with or manage
Capable of being easily led, taught, or managed.
Capable of being shaped; malleable.
Sufficiently operationalizable or useful to allow a mathematical calculation to proceed toward a solution.
Algorithmically solvable fast enough to be practically relevant, typically in polynomial time.