verb move or balance unsteadily; sway back and forth
adjective unstable or shaky
adverb in an unsteady or shaky manner
adjective an adjective is a word that describes or modifies a noun or pronoun. In this case, 'tottering' describes something that is unsteady or about to collapse.
noun a person or thing that is not securely fixed or fastened
adjective not securely fixed or fastened