"Trustily" is a word in ENGLISH

katútum - Courage, bravery, fidelity, trustiness, allegiance, loyalty, fealty, devotion. (tútum).

matútum - Brave, valiant, courageous, faithful, reliable, trustworthy, trusty, doughty, loyal, stanch, staunch, zealous. (cf. tútum, maísug, salalígan, matinatápon, mapísan).

Not firm or trusty; unsound; defective; treacherous; unsafe; as, a rotten plank, bone, stone.

salalígan - Reliable, trustworthy, meriting confidence, staunch, true, trusty, constant, dependable, faithful, loyal, one to be depended upon. (cf. sálig).

Sure; certain; trusty.

Worthy of trust; faithful; trusty; trustworthy.

The quality or state of being trusty.

In old European law. Trust; falth; confidence; fidelity

Worthy of trust or confidence; trusty.

Admitting of being safely trusted; justly deserving confidence; fit to be confided in; trustworthy; reliable.

Involving trust; as, a trusty business.

Hence, not liable to fail; strong; firm.

tútum - Reliability, trustworthiness, faithfulness; to be or become reliable trustworthy, brave, trusty, valiant, faithful to one’s duty (under difficulties), …

Not secret; not close; not trusty; indiscreet.

Not to be trusted; not trusty.