Synonyms of stiffly

2 Syllables
stably, firmly
3 Syllables
awkwardly, uncouthly, ineptly, durably, bunglingly, fumblingly, gawkily, clumsily
4 Syllables
carelessly, unshakeably, gracelessly, lumberingly, unadroitly, unskillfully
5 Syllables
inelegantly, ungracefully