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All answers having "Trifling" as clue:

4 Character Answers:

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IDLE

MERE

POKY

PUNY



5 Character Answers:

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INANE

MINOR

PETIT

PETTY

POKEY

SMALL

TEENY

TOKEN



6 Character Answers:

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FUTILE

LITTLE

MEASLY

MINUTE

PALTRY

RASHLY

TOYING



7 Character Answers:

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NOMINAL



8 Character Answers:

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NUGATORY

PICAYUNE

SPORTING



9 Character Answers:

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DALLIANCE

FRIVOLOUS

NOACCOUNT

PENNYANTE



13 Character Answers:

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INSIGNIFICANT

NOTWORTHADARN



15 Character Answers:

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INCONSEQUENTIAL

MONKEYINGAROUND