clueless

As a letter s

is the letter s with a.

As an adjective clueless is

lacking knowledge or understanding; uninformed.

As adjectives the difference between inaccurate and clueless

is that inaccurate is mistaken or incorrect; not accurate while clueless is lacking knowledge or understanding; uninformed.

As adjectives the difference between feckless and clueless

is that feckless is lacking purpose while clueless is lacking knowledge or understanding; uninformed.

As adjectives the difference between clueless and undefined

is that clueless is lacking knowledge or understanding; uninformed while undefined is lacking a definition or value.

As an adjective clueless

is lacking knowledge or understanding; uninformed.

As a noun null is

zero, nil; the cardinal number before einn.

As adjectives the difference between clueless and ditzy

is that clueless is lacking knowledge or understanding; uninformed while ditzy is silly or scatterbrained, usually of a woman.

As adjectives the difference between hapless and clueless

is that hapless is very unlucky; ill-fated while clueless is lacking knowledge or understanding; uninformed.

As an adjective clueless

is lacking knowledge or understanding; uninformed.

As a noun idiot is

(slang|derogatory) a proponent of intelligent design.

As adjectives the difference between clueless and oblivious

is that clueless is lacking knowledge or understanding; uninformed while oblivious is (usually followed by to or of) Lacking awareness; unmindful; unaware, unconscious of.