How to pronounce stimulus

noun, plural stim·u·li [stim-yuh-lahy]. something that incites to action or exertion or quickens action, feeling, thought, etc.: The approval of others is a potent stimulus. Physiology, Medicine/Medical.

: something that rouses or incites to activity: such as. a : incentive. b : stimulant sense 1.

When the T and D sounds come between two other consonant sounds, many Americans will drop them. But when we add the -ly ending, it now comes between two consonants. You’ll hear a lot of native speakers say ‘exactly‘, with no T sound. Exactly, exactly.