"The thing that has caught people by surprise is that the Fed has wound back its forecasts for GDP next year from 2.5 per cent to 2.3 per cent," Solly said.
Officials had a median projection of one move in 2020.
Fed chairman Jerome Powell and his colleagues said "economic activity has been rising at a strong rate'' in a statement Wednesday following a two-day meeting in Washington.
The Fed acknowledged the possible threats coming from a softening world economy.
Wednesday's unanimous 10-0 decision lifted the target range for the federal funds rate to 2.25 per cent to 2.5 per cent.
Financial markets have been turbulent for weeks, with the S&P 500 Index of US stocks dropping 13 per cent from the end of September through to Tuesday.
Yields on 10-year US Treasuries have also been volatile, dropping to 2.82 per cent this week after hitting a seven-year high of 3.26 per cent in October.
Powell's task is also complicated by the repeated attacks from Trump.
-- Additional reporting Bloomberg