1. (adjective) fixed and unmoving

• rigid
• set

2. (adjective) incapable of being changed or moved or undone; e.g.

• frozen

1. (adjective) (of a number) having a fixed and unchanging value

• determinate

2. (adjective) fixed and unmoving

• nonmoving
• unmoving

3. (adjective) securely placed or fastened or set

• fast
• firm
• immobile
• geostationary
• geosynchronous
• leaded
• stationary
• taped
• unadjustable

4. (adjective) incapable of being changed or moved or undone; e.g.

• unchangeable

1. (adjective) securely placed or fastened or set

• secure

1. (adjective) (of a number) having a fixed and unchanging value

• fixedness
• unalterability

2. (adjective) fixed and unmoving

• fastness
• fixedness
• fixity
• fixture
• secureness
• fixedness
• immobility
• stationariness
• rigidity
• rigidness

3. (adjective) securely placed or fastened or set

• fastness
• fastness
• fixedness
• fixedness
• fixity
• fixity
• fixture
• fixture
• secureness
• secureness

4. (adjective) incapable of being changed or moved or undone; e.g.

• fastness
• fixedness
• fixity
• fixture
• secureness

1. (adjective) securely placed or fastened or set

• unfixed