The way he stared deep into her eyes was making her uncomfortable. For a first date, this was too much intensity. Intensity is the degree, volume, or magnitude of a thing, such as fire, emotion, weather, work, or passion.

Intensity is a word sometimes associated with passion, fire, and violence. It's used when discussing the level of such things as a love affair or, perhaps, a flame. For example, the intensity of the relationship between Bergman and Bogart in Casablanca was very high. Likewise, meteorologists measure the intensity of tornados on the Fujita Scale. Some things are meant to show intensity, such as performance by a great musician. Other things, such as, say, a blanket...not so much.

Primary Meanings of intensity

high level or degree; the property of being intense
the amount of energy transmitted (as by acoustic or electromagnetic radiation)
Full Definitions of intensity

n high level or degree; the property of being intense

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force, forcefulness, strength
physical energy or intensity
badness, severeness, severity
used of the degree of something undesirable e.g. pain or weather
emphasis, vehemence
intensity or forcefulness of expression
the greatest possible intensity
ferocity, fierceness, furiousness, fury, vehemence, violence, wildness
the property of being wild or turbulent
main force of a blow etc
impulse, momentum
an impelling force or strength
energy, vigor, vigour, zip
forceful exertion
foulness, raininess
(of weather) the badness of the weather
distressfulness, seriousness
the quality of arousing fear or distress
too much emphasis
savageness, savagery
the property of being untamed and ferocious
Type of:
degree, grade, level
a position on a scale of intensity or amount or quality

n chromatic purity: freedom from dilution with white and hence vivid in hue

chroma, saturation, vividness
Type of:
color property
an attribute of color

n the amount of energy transmitted (as by acoustic or electromagnetic radiation)

“he adjusted the intensity of the sound”
intensity level, strength
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radio brightness
the strength of a radio wave picked up by a radio telescope
threshold level
the intensity level that is just barely perceptible
field intensity, field strength
the vector sum of all the forces exerted by an electrical or magnetic field (on a unit mass or unit charge or unit magnetic pole) at a given point in the field
candlepower, light intensity
luminous intensity measured in candelas
acoustic power, sound pressure level
the physical intensity of sound
half the maximum intensity
magnetic field strength, magnetic flux density, magnetic induction, magnetic intensity
the amount of magnetic flux in a unit area perpendicular to the direction of magnetic flow
Type of:
the property of relative size or extent (whether large or small)

n the magnitude of sound (usually in a specified direction)

loudness, volume
a sound property that is free from loudness or stridency
(music) a gradual increase in loudness
forte, fortissimo
(music) loud
a crescendo followed by a decrescendo
Type of:
sound property
an attribute of sound