obsession
noun
ob·ses·sion
äb-ˈse-shən
əb-
1
: a persistent disturbing preoccupation with an often unreasonable idea or feeling
broadly
: compelling motivation
an obsession with profits
has an obsession with gambling
2
: something that causes an obsession
Losing weight can be an obsession that results in the avoidance of certain foods.
obsessionally
adverb
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Merriam-Webster unabridged
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