1
general::
slowly
at a slow speed:
• Large white clouds drifted slowly across the sky. • The situation is slowly improving.
gradually
happening slowly over a period of time:
• I practised every day, and gradually got better. • Many of our forests are gradually disappearing.
little by little/bit by bit
slowly, in a series of small amounts or stages:
• Add the olive oil, little by little. • It’s best to do the work bit by bit.
at a snail’s pace
extremely slowly, especially when this is annoying:
• Traffic was moving at a snail’s pace. • The project seems to be moving at a snail’s pace.
Longman-Thesaurus