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subtle

microbe

microscopic

to smile

faint

slight movement

slight earthquake

minuscule amount

smile

minute

microscope

slight

corpuscle

subtleties

particle

slight fever

little power

electron microscope

feeble

particle

total differential

differential calculus

neutrino

to the best of one's meager ability

differentiation

microfossil

differentiation

microgravity

antineutrino

microtopography

infinitesimal

differential quotient

differentiable

exact differential

extreme decline

to budge

WeChat (Chinese messaging app)

traveling incognito

microscopic

microchemistry

derivative

small token (of gratitude)

WeChat Pay

microclimate

microbiology

differential equation

logarithmic differentiation

micro evidence

microtubule

volcanic tremor

infinitesimal calculus

micrometeorological phenomenon

microbiologist

microbial

slight reduction

calculus

slight revision

very slow speed

infinitesimal calculus

sensitive information

faint light

slight increase

micromanometer

differential coefficient

fine motor skill

microearthquake

biodegradation

minute difference

ordinary differential equation

minute adjustment

trace element

lukewarm

trace gas

pathogenic microbe

micrometer

smile diplomacy

not completely unthinkable

American Society for Microbiology

eukaryotic microorganism

microanalysis

micronutrient

very slow speed

microscopic

partial differential equation

micropyrometer

water flea (Daphnia spp.)

minute

ultrastructure

differential cross-section

ultra-microearthquake

partial derivative

hyperfine

infinitely differentiable

stochastic differential equation

clothing designed not to attract attention

linear differential equation

microbial genetics

partial differential equation

faint, ironic or bittersweet smile

Weibo (Chinese microblogging service)

microcline

effective microorganisms

to smile back (at a person)

to smile (gently)

smile

to smile (at someone)

heartwarming

very small amount

slight

minuteness

slight wound

Nosema bombycis (microsporidian parasite responsible for pebrine)

pebrine (disease of silkworms)

minor offense

planetesimal

lukewarmness

low-power transmission

detailed

subtle

time-lapse photography

light rain

lightly coated paper

(fine) particle

nonlinear differential equation

cyclops (any minute crustacean of genus Cyclops)

slightly sparkling

broken into small fragments

fine-grain development

Japanese Society of Soil Microbiology

Sina Weibo (Chinese microblogging service)

extremophile

(in) a humble position with a small stipend

Asian watermeal (Wolffia globosa)

ominous smile

microbial fuel cell

small breasts

Basic Instinct (1992 film)

obscurity

decline

hypotonic contractions (during labor (labour))

complex and subtle (delicate)

to go into the minutest details

powder

microbiota

Purple Forbidden Enclosure (group of constellations in the northern sky associated with the emperor)

microinsemination

phase-contrast microscope

very low in sugar content

optical microscope

rice granules