unfirm
1. [ adjective ] not firmly or solidly positioned
Synonyms: unsteady
Examples:

"climbing carefully up the unsteady ladder" "an unfirm stance"

Related terms: unfixed
2. [ adjective ] (of soil) unstable
Synonyms: shifting
Examples:

"shifting sands" "unfirm earth"

Related terms: loose
Similar spelling:   uniform
  uniformly
  uniformed
  unfair
  unpermed
  unpaired
  unformed
  unfairly
  unafraid
  unbar
  unpierced