(a.) Worthy of trust or confidence; trusty.

accurate authoritative believable calculable colorable conceivable convincing credible dependable ethical exact fail-safe faithful faithworthy fast fiduciary firm guaranteed harmless honest honorable incorruptible invincible inviolable invulnerable loyal moral plausible predictable principled proven realistic reliable responsible riskless scrupulous secure solid sound stable staunch steadfast steady straight substantial sure surefire tenable tested to be trusted tried tried and true TRUE trustable trusty truthful undangerous unexceptionable unfailing unfalse unhazardous unimpeachable unperfidious unperilous unprecarious unquestionable unrisky untreacherous upright valid veracious warranteed well-founded well-grounded worthy of faith