undecidable is a valid English word

Scrabble validity: valid ( international - Sowpods, US - Twl06 )
iScramble validity: valid
QuickWords validity: valid

Meanings

Adjective (NOT COMPARABLE)

(mathematics computing theory) Incapable of being algorithmically decided in finite time. For example, a set of strings is undecidable if it is impossible to program a computer (even one with infinite memory) to determine whether or not specified strings are included.
(mathematics) (of a WFF) logically independent from the axioms of a given theory; i.e., that it can never be either proved or disproved (i.e., have its negation proved) on the basis of the axioms of the given theory. (Note: this latter definition is independent of any time bounds or computability issues, i.e., more Platonic.)

undecidable is a Scrabble valid word

u1n1d2e1c3i1d2a1b3l1e1

• International English (Sowpods) - The word is valid in Scrabble ✔
• US English (TWL06) - The word is valid in Scrabble ✔
• 17 points

undecidable is an iScramble, QuickWords valid word

u1n2d3e4c5i6d7a8b9l10e11

• The word is valid in iScramble ✔
• The word is valid in QuickWords ✔
• 66 points

Same letters words (Anagrams)

• none

Same letters plus one

• UNDECIDEABLE

Same letters minus one

• INDUCEABLE
• INEDUCABLE