"stood in the doorway diffident and abashed"
"problems that call for bold not timid responses"
"a very unsure young man"
"uncertain of his convictions"
"unsure of himself and his future"
"moving with uncertain (or unsure) steps"
"an uncertain smile"
"touched the ornaments with uncertain fingers"
Utterly unsafe to touch, and unsure to stand on.
出自: Burke