unfirm

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

1. not firmly or solidly positioned
- climbing carefully up the unsteady ladder
- an unfirm stance
• Syn:
unsteady
• Similar to:
unfixed
• Derivationally related forms:
unsteadiness (for: unsteady)
2. (of soil) unstable
- shifting sands
- unfirm earth
• Syn:
shifting
• Similar to:
loose