Synonym for insignificant is "minor"

accidental [adjective]

means "incidental"
insignificant, dispensable, expendable, minor, nonessential, secondary

expendable [adjective]

means "incidental"
insignificant, dispensable, accidental, minor, nonessential, secondary

few [adjective]

means "amount"
scant, meagre, small, little, insufficient, insignificant

idle [adjective]

means "trivial"
insignificant, trifling, unimportant, useless, worthless, vain

ignoble [adjective]

means "base"
insignificant

inconsequent [adjective]

means "inferior"
insignificant, unessential, mean, unimportant, nonessential, low

insubstantial [adjective]

means "unimportant"
inconsequential, insignificant, negligible, immaterial, flimsy, trifling

lesser [adjective]

means "trivial"
diminutive, inconsiderable, insignificant, petty, little, negligible

little [adjective]

means "size"
trivial, insignificant, petty, unimportant, minor, slight

- translate little

meager [adjective]

means "scanty"
slight, sparse, insubstantial, scant, insignificant, insufficient

mean [adjective]

means "property"
inferior, insignificant, unessential, inconsequent, unimportant, nonessential

mere [adjective]

means "small"
minor, insignificant

minor [adjective]

means "reduction"
lesser, inconsiderable, inferior, insignificant, petty, secondary

negligible [adjective]

means "unimportant"
inconsequential, insignificant, insubstantial, immaterial, flimsy, trifling

nonessential [adjective]

means "unimportant"
immaterial, inconsequential, insignificant, simple, unnecessary, trivial

pardonable [adjective]

means "forgivable"
venial, excusable, minor, inconsequential, justifiable, insignificant

petty [adjective]

means "trivial"
diminutive, inconsiderable, insignificant, lesser, little, negligible

piddling [adjective]

means "trifling"
petty, trivial, unimportant, insignificant, niggling, paltry

potty [adjective]

means "snooty"
high-hat, snobbish, insignificant, foolish, crazy

shallow [adjective]

means "trite"
superficial, inconsequential, frivolous, silly, insignificant, trifling

simple [adjective]

means "property"
unimportant, immaterial, inconsequential, insignificant, nonessential, unnecessary

slender [adjective]

means "few"
scant, meagre, small, little, insufficient, insignificant

slight [adjective]

means "property"
insignificant, petty, trifling, trivial, unimportant, superficial

slim [adjective]

means "property"
insignificant, inconsiderable, remote, small, poor, trifling

small [adjective]

means "size"
insignificant, minor, trivial, unimportant, petty, inconsequential

- translate small

sorry [adjective]

means "property"
unimportant, trivial, insignificant, small, beggarly, stunted

- translate sorry

subordinate [adjective]

means "inferior"
minor, lower, subject, junior, insignificant, secondary

tenuous [adjective]

means "insubstantial"
insignificant, trivial, trifling, unimportant, slight, flimsy

trifling [adjective]

means "worthless"
insignificant, unimportant, trivial, petty, immaterial, frivolous

trivial [adjective]

means "idle"
insignificant, trifling, unimportant, useless, worthless, vain

unavailing [adjective]