Without sense; absurd.

Not standard. / (linguistics) Not conforming to the standard variety, or to the language as used by the majority of its speakers.

Something that is not standard.

A project that has no chance of success / A horse that does not run in a race for which it has been entered / A loser; a person who is bound to fail.

(mathematics, humorous) Details which are straightforward but so tedious that an author or lecturer would rather skip them (especially those of a category theoretical nature).

(genetics) A point mutation that generates either a premature stop codon, or a codon that does not specify any amino acid.

Not sectarian. / Of or pertaining to nonsectarianism.

One who is not a sectarian.

Practical, not tolerating from others or concerning oneself with anything silly or unimportant. / No-frills.

Having a surface designed to prevent or reduce skidding; not able to skid or be skidded upon.