For an extremely good reason. / Used to soften the impact of what is said next, implying that it is important. / Used other than figuratively or idiomatically: see not, for, nothing.

If one takes no risks, one will not gain any benefits.

(idiomatic) Useless; worthless.

A person of little worth or usefulness.

(informal) Something that is decent, acceptable, or worthwhile.

(idiomatic) A very short (but unspecified) amount of time; no time at all.

Being or relating to a situation that will either succeed completely or fail completely.

(idiomatic) Insubstantial or romantic words that are only meant to flatter, woo, or seduce.

(idiomatic) Something ordinary or run-of-the-mill. / (idiomatic) Nothing worth discussing; nothing that the speaker wants to mention.

Without reference to anything. / Without any apparent reason or purpose.