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.
Not ponderable; without sensible or appreciable weight; incapable of being weighed.
Difficult or impossible to comprehend or evaluate.
An imponderable question.
A factor that cannot be anticipated.
An imponderable substance or body; specifically, in the plural, a name formerly applied to heat, light, electricity, and magnetism.