Synonyms for Narrow (same or very similar meaning)
WordNet sense 1 (just barely adequate or within a lower limit):
bare
WordNet sense 2 (strict and severe):
strait
WordNet sense 3 (very narrow):
slender, thin
WordNet sense 4 (small in range or scope):
limited
WordNet sense 5 (define clearly):
specify, nail down, pin down, narrow down, peg down
WordNet sense 6 (become more special):
specialize, specialise
WordNet sense 7 (characterized by painstaking care and detailed examination):
minute, minute
WordNet sense 8 (exercising caution or showing care or attention):
careful
WordNet sense 9 (narrow-minded about cherished opinions):
illiberal
WordNet sense 10 (characterized by assertion of unproved or unprovable principles):
dogmatic
WordNet sense 11 (lacking tolerance or flexibility or breadth of view):
narrow-minded
WordNet sense 12 (make or become more narrow or restricted):
contract, contract
WordNet sense 13 (become tight or as if tight):
constrict, constringe
From the ODE community, based on WordNet
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