Having a solid, almost unyielding surface or structure. The mattress was firm, providing excellent support for her back.
Strongly felt and unlikely to change; resolute. He was firm in his decision to pursue a career in medicine.
Securely fixed in place; not likely to move or be displaced. The tent was held firm by the stakes driven deep into the ground.
Having a steady, unwavering quality or character. She gave a firm handshake, indicating her confidence.
Of a price, market, or currency: steady or rising and unlikely to decline. Share prices remained firm throughout the morning session.
(of flesh or muscles) Not soft or flabby; taut and strong to the touch. Regular exercise kept her arms firm and well-toned.