Antonyms of adj unfirm

2 senses of unfirm

Sense 1
unfirm, unsteady -- (not firmly or solidly positioned; "climbing carefully up the unsteady ladder"; "an unfirm stance")

INDIRECT (VIA unfixed) -> fixed -- (securely placed or fastened or set; "a fixed piece of wood"; "a fixed resistor")

Sense 2
shifting, unfirm -- ((of soil) unstable; "shifting sands"; "unfirm earth")

INDIRECT (VIA loose) -> compact -- (closely and firmly united or packed together; "compact soil"; "compact clusters of flowers")

Similarity of adj unfirm

2 senses of unfirm

Sense 1
unfirm, unsteady -- (not firmly or solidly positioned; "climbing carefully up the unsteady ladder"; "an unfirm stance")
       => unfixed (vs. fixed) -- (not firmly placed or set or fastened)

Sense 2
shifting, unfirm -- ((of soil) unstable; "shifting sands"; "unfirm earth")
       => loose (vs. compact) -- (not compact or dense in structure or arrangement; "loose gravel")