improvisate

Improvisate, im-prov′i-sāt, Improvise, im-pro-vīz′, v.t. to compose and recite, esp. in verse, without preparation: to bring about on a sudden: to do anything off-hand.—ns.

He now began to improvisate in Italian.

Only I often improvisate for them an evening blessing,--because they have no prayer-book,--and weave in with the blessing hints which might be of medical service to the pair, if they chose.